Go to any thread where the OP has posted more than once, and there are replies from other users.
Note a highlighted message next to the thread title says "X replies" where X is the number of messages in the thread (excluding the OP).
Click "See all" on one of the OP's posts.
Now the message says "Y replies" where Y is the number of OP posts.
But this is not the number of replies to the OP, it's the number of OP posts. The message ought to show the full number of replies, or be omitted in this case.
I've tried on Brave browser and FireFox.