Not a big bug but why?

[Tutube]

Hey @Sweezy .I just meet a bug or something but it’s look very weird,it’s about the edit.
I want to edit a post that I posted long time ago.But when I finish edit it says “422 error”.
Actually,I still can edit that but what does that “422 error” mean?
I’ll show you some picture:

[Tutube]

This is before edit:

[Tutube]

After finish edit:
It still change…

[Tutube]

But this is what I meet when i click “Save Edit”:
It says "422 error
Please fix this,@Sweezy.

[Catstrophe]

After like 30 days you cannot edit it

[Tutube]

I guess we still can edit but it will appear a sentence:"…"idk

[Tr_n_Th_Huong]

realy bro

[banned]

Hes leader bruj he probably knows

[Catstrophe]

Yes I do know