diff --git a/CryptoExchange.Net/Clients/BaseApiClient.cs b/CryptoExchange.Net/Clients/BaseApiClient.cs
index 639b4fc..80377dd 100644
--- a/CryptoExchange.Net/Clients/BaseApiClient.cs
+++ b/CryptoExchange.Net/Clients/BaseApiClient.cs
@@ -25,6 +25,8 @@ namespace CryptoExchange.Net
     {
         private readonly ApiCredentials? _apiCredentials;
         private AuthenticationProvider? _authenticationProvider;
+        private bool _created;
+
         /// <summary>
         /// The authentication provider for this API client. (null if no credentials are set)
         /// </summary>
@@ -32,8 +34,11 @@ namespace CryptoExchange.Net
         {
             get 
             {
-                if (_authenticationProvider == null && _apiCredentials != null)
+                if (!_created && _apiCredentials != null)
+                {
                     _authenticationProvider = CreateAuthenticationProvider(_apiCredentials);
+                    _created = true;
+                }
 
                 return _authenticationProvider;
             }
@@ -51,7 +56,7 @@ namespace CryptoExchange.Net
         /// <param name="apiOptions">Api client options</param>
         protected BaseApiClient(BaseClientOptions options, ApiClientOptions apiOptions)
         {
-            _apiCredentials = apiOptions.ApiCredentials ?? options.ApiCredentials;
+            _apiCredentials = apiOptions.ApiCredentials?.Copy() ?? options.ApiCredentials?.Copy();
             BaseAddress = apiOptions.BaseAddress;
         }
 
diff --git a/CryptoExchange.Net/Converters/DateTimeConverter.cs b/CryptoExchange.Net/Converters/DateTimeConverter.cs
index 79714ab..a49459f 100644
--- a/CryptoExchange.Net/Converters/DateTimeConverter.cs
+++ b/CryptoExchange.Net/Converters/DateTimeConverter.cs
@@ -12,6 +12,7 @@ namespace CryptoExchange.Net.Converters
     public class DateTimeConverter: JsonConverter
     {
         private static readonly DateTime _epoch = new(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+        private const long ticksPerSecond = TimeSpan.TicksPerMillisecond * 1000;
         private const decimal ticksPerMicrosecond = TimeSpan.TicksPerMillisecond / 1000;
         private const decimal ticksPerNanosecond = TimeSpan.TicksPerMillisecond / 1000m / 1000;
 
@@ -127,7 +128,7 @@ namespace CryptoExchange.Net.Converters
         /// </summary>
         /// <param name="seconds"></param>
         /// <returns></returns>
-        public static DateTime ConvertFromSeconds(double seconds) => _epoch.AddSeconds(seconds);
+        public static DateTime ConvertFromSeconds(double seconds) => _epoch.AddTicks((long)Math.Round(seconds * ticksPerSecond));
         /// <summary>
         /// Convert a milliseconds since epoch (01-01-1970) value to DateTime
         /// </summary>
diff --git a/CryptoExchange.Net/OrderBook/SymbolOrderBook.cs b/CryptoExchange.Net/OrderBook/SymbolOrderBook.cs
index 1a10689..c506d3e 100644
--- a/CryptoExchange.Net/OrderBook/SymbolOrderBook.cs
+++ b/CryptoExchange.Net/OrderBook/SymbolOrderBook.cs
@@ -3,6 +3,7 @@ using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
+using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using CryptoExchange.Net.Interfaces;
@@ -493,15 +494,15 @@ namespace CryptoExchange.Net.OrderBook
         /// <returns></returns>
         public string ToString(int numberOfEntries)
         {
-            var result = string.Empty;
-            result += $"Asks ({AskCount}): {Environment.NewLine}";
-            foreach (var entry in Asks.Take(numberOfEntries).Reverse())
-                result += $"  {entry.Price.ToString(CultureInfo.InvariantCulture).PadLeft(8)} | {entry.Quantity.ToString(CultureInfo.InvariantCulture).PadRight(8)}{Environment.NewLine}";
-
-            result += $"Bids ({BidCount}): {Environment.NewLine}";
-            foreach (var entry in Bids.Take(numberOfEntries))
-                result += $"  {entry.Price.ToString(CultureInfo.InvariantCulture).PadLeft(8)} | {entry.Quantity.ToString(CultureInfo.InvariantCulture).PadRight(8)}{Environment.NewLine}";
-            return result;
+            var stringBuilder = new StringBuilder();
+            stringBuilder.AppendLine($"   Ask quantity       Ask price | Bid price       Bid quantity");
+            for(var i = 0; i < numberOfEntries; i++)
+            {
+                var ask = asks.Count > i ? asks.ElementAt(i).Value: null;
+                var bid = bids.Count > i ? bids.ElementAt(i).Value: null;
+                stringBuilder.AppendLine($"[{ask?.Quantity.ToString(CultureInfo.InvariantCulture),14}] {ask?.Price.ToString(CultureInfo.InvariantCulture),14} | {bid?.Price.ToString(CultureInfo.InvariantCulture),-14} [{bid?.Quantity.ToString(CultureInfo.InvariantCulture),-14}]");
+            }
+            return stringBuilder.ToString();
         }
 
         private void CheckBestOffersChanged(ISymbolOrderBookEntry prevBestBid, ISymbolOrderBookEntry prevBestAsk)