When teleporting the font in the chat is not the normal font. (This is with the default resource pack.)
NOTE: In the included picture it has the font from issuing the /kill command and then the font from teleporting. If it makes a difference the teleporting was done via Command Block.
Related issues
duplicates
Attachments
Comments
migrated
[media]
_zombiehunter
Has nothing to do with teleporting, it's the broken italic font. See MC-23928 and some other dublicates ...
I see. Well then a mod can close this if they desire.