Hi @PatriciaNavarre ...
Wow...that sounds pretty strange! I'll admit that I've never really used the Chat feature of Canvas myself...as I was a former Canvas administrator at the college I worked for...so I didn't really get to have meaningful conversations using the Canvas Chat feature. Have you tried using a different web browser to see if the chats display better?
What are the browser and computer requirements for Instructure products?
Also, you might try clearing your browser's cache/history files. Once you do that, try closing the browser completely. Then, re-start the browser, log back in to your Canvas course, and see if anything changed in the Chat interface.
Beyond that, if you are still seeing things out of order like you've described, I'd suggest reaching out to Canvas Support.
It would be great to hear back from you once you get this resolved. Hopefully one of these things will help remedy the situation. Please keep us posted...thanks!