What is happening:
I have talked to all the ponies and the marked stayed.
I am a filly by the way.
What should be happening:
It should have completed it, but it didn't and now I don't have the marker on the teacher

Steps to reproduce the issue:
Start as a pegasus in cloudpolis, then when you get the "What makes us special" quest, talk to one pony in 1 sever.
Note: That I use "Amareicas" server but inside of it there are other servers switch there and after, talk to the other ponies and then you're stuck.

Reproduced by:

Screenshots:
sorry, don't have any.

Note: Broke other quest too.