Don't know why the page with FB login button loads so strangely for me? Especially when viewed on a mobile phone. That it seems to be flashing? It will increase, it will decrease. It's ugly. I can't figure it out.
I still have practically the same website. Where this doesn't happen. I've compared sites and I can't figure out where the difference is.
I also compared the used FB app and they are the same.
Thank you for your help.
I don't see flashing. The only issue is the not-centered button. Insert this CSS code in Dashboard > Forums > Settings > Styles > Custom CSS Code textarea, save it, delete all caches, go to forum front-end and press Ctrl+F5. Use a new private / incognito browser tab to avoid mobile browser cache, otherwise you'll not see any changes:
#wpforo #wpforo-wrap .wpforo-login-wrap .wpf-field .wpf-field-wrap {position: relative;}
@media screen and (max-width:800px) {
#wpforo #wpforo-wrap .wpforo-fb-login-wrap{padding: 5px 0;display: flex;justify-content: center;position: relative;}
}