Hi! Are you using Kitsun as a app or from within safari itself?
I am aware of a bug in older iOS versions not saving cookies when using websites as progressive web apps.
Normally speaking the session stays active for 30 months after your latest login, so after the first time you dont need to log in at all if you frequently use it…
Any chance cookies are disabled for Kitsun? These are required to keep you logged in.
What iOS device and version number are you using?
For anyone else using iOS, does this happen to you as well?