Thank you for the report. Both of these are known issues and it's quite cumbersome to have to manually search for groups that you belong to if you are a member for more than 10.
The other bug is that you cannot view these groups if you have more than 10 through the mobile app, it's not just the web browser version. Thanks for posting this and I will pass this along!
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I had a feeling they were too large not to have been noted, particularly the first, but I hadn't seen any mention. Happy to help!