Hi Von, I have both issues. The first is caused by a limit to the number of squads the list shows. It only shows the first few, so you have to search, which is tough for some people.
The second issue, seems to be a general issue with Squad chat. I have 2 devices with 2 accounts. I can see different amounts of history for chat from each device/account. One the one that I use to manage membership, I sometimes don't see join requests, or I see them only after closing and restarting the game a few times.