Can't post server to planetminecraft

I've had my server on PCM for a while now. A day or two ago, it started saying that the amount of players on my server was unknown. But it said it was online and is pinging to it. People thought that my server was empty because the amount of players was "unknown". I tried deleting the server And putting it up fresh. When I tried to verify it, it says: ''Problem: your server does not appear to follow any know minecraft protocol standard. 5 tries left.

I am reloading my server each time and waited a few minutes each time. The ip is correct and it says it's connected but when I try to verify it this happens.

I recently added some new plugins.


Please help me!