What does this mean?

[KPDP_]

Hi, Apologies if this question is posted in the wrong place, I am very new to obs and streaming.
Can someone tell me what that means in my screenshot attached with a user name? It looks like they followed me but the name doesn't come up under my followers list

 

[R1CH]

You aren't using OBS, so you should contact Streamlabs for help.