[Marker] message spam?

I'm fairly new to server hosting, so apologies if this seems like something obvious, this has never happened and im not quite sure what [Marker] is, im running the server with the latest 1.20.1 paper fork via a Docker VM, im aware that whenever i say something via the server console it shows up as [Not secure] [Server] but a second back after testing some stuff and spawning an iron golem, what appears on the pic showed up, 9 messages in a row of just "hi", thought it was nothing until i saw the console showing that. im a bit worried it may be something serious, any help is appreciated.
Markerhi_spam.png
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