Chatbot/Grammarbot refresh question

I am new to Pro, I am going through the French course and have hit level 2, but I am still getting the old question/chat sessions I have had at the beginning of the course.
How often do the chatbot and grammerbots refresh will new chats?

Thank you.

I am also curious about this. I have the Pro version, but only seem to have four grammatbot chats and three chatbot chats available. There also seem to be levels missing. For example, level 2 says it has 26 levels, but only 19 appear. Level 3 says it has 44 levels, but only 37 appear. I assume that these missing levels are where the chat and grammarbots are supposed to go?