Hello. I am experiencing the same problem. https://wodstar.com/login-register/ . This works with no problems when I log in from a laptop. I checked my Facebook developer account and see that I am in good standing and that there shouldn’t be anything wrong with the app.
It ‘loads’ forever on my iPhone and doesn’t log me in, but when I hit ‘refresh’ it does.
Let me know what else you need to know.