When using this site on firefox in Android 14 on Sony Xperia 5 V the keyboard does not appear when posting nor when trying to reply to posts. Also the site will flicker oddly. Chrome seems not to have these problems. The logo does not show when making a home screen link on firefox nor chrome.
You would need to file a bug report with discourse.
How do I file a bug report?
Works fine for me. Maybe test in a private window, check/disable plugins/extensions. Maybe worth trying Firefox Focus too.