Been buggy lately

Lately when Im on my phone I cant seem to join off of a link that Im being given to join and have to manually type in the join code. Every time I try to join by a link it takes me to the App Store to download the app however I already have the app downloaded on my phone and if I try to open it from that page I get nothing except the home page.

FallOutRed about join.me - Simple Meetings