I'm also on lemmy.world and jerboa is working ok for me. Two jankinesses I'm aware of are:
In certain scenarios where the network gets interrupted, Jerboa seems to get permanently confused and is unable to recover. The workaround is to restart your phone or go into app settings and force-kill jerboa and it will work for a while again. This happened to me a bunch in the first few days (maybe in response to server restarts) and has been ok since. I saw this AFTER logging in and it would kill my session. Not sure if this would affect initial login or not.
I've read but not experienced that Jerboa gets confused by passwords with commas in them. Do you have one of those in your email or password? If so, maybe try logging in via username or change your password to something different.
Yeah I've noticed all sorts of odd issues with Jerboa. I think the best solution for now is to keep using a browser. I heard that someone was working on a reddit compatible API for Lemmy so that apps like RIF can have an easy transition. I think that might be the best end solution tbh, to use apps that are already well built.
Good to know it's working for you. That narrows down the problem, for sure. Tried to force stop the app and try again. Same thing happend. And I don't have a comma in any of my login credentials. Thanks for the tips to try, though.