Not deleting chat history

[DevJhns]

I have few chats left in chat history and cant delete them.
At first deleted few, but then for some reasone it stopped deleting them.
??????????
Are there any specific conditions???
I use multiple models, should i use specific one to delete chat? ->

1. chat with model1
2. switch to model2
3. chat with model 2
4. trying to delete chat with model1 while model2 in use

is this is case?
firefox extension