Fix OSB price duplicationon delayed lookup (#5860)

Fixes #5858

runelite-client/src/main/java/net/runelite/client/plugins/grandexchange/GrandExchangePlugin.java

@@ -338,6 +338,12 @@ public class GrandExchangePlugin extends Plugin
 
 		executorService.submit(() ->
 		{
+			if (geText.getText().contains(OSB_GE_TEXT))
+			{
+				// If there are multiple tasks queued and one of them have already added the price
+				return;
+			}
+
 			try
 			{
 				final GrandExchangeResult result = CLIENT.lookupItem(itemId);