On my apple watch I receive a imessage, I twist my wrist to show the message but for it always shows me the old messages and then the new imessage? How can I stop this so it either just shows me the new message or the actual up to date thread?
This is a watchOS 2 Bug
The issue as described is basically that old, previously read/dismissed messages in a conversation continue to show up when new messages arrive (zombie messages) long after they were initially received and were marked as read.
The fix described here is to delete the offending conversation on Apple Watch. Once this has been done, notifications for conversations with that contact will begin to function normally.
Doing this will not delete the conversation from any other device so you don't have to worry about losing your conversation, so even though it seems destructive, this is a non-destructive fix in that sense.
Note: the next time a notification for that same contact is received by the watch, the deleted conversation will be restored and viewable from the watch. Prior to that the conversation will not be present within the watch's Messages app's conversations list.