Support Forum

well, several things jump out...

first the wp theme is violating wp standards and loading its own copy of jquery ui... this may cause issues with the version of jquery ui that wp loads...  not likely this problem but may cause others...

you are seeing the misload page because all of the forum css is missing...  this is the css file attempted to be loaded:

https://floorballtoday.com/wp-content/sp-resources/forum-themes/reboot/styles/reboot.php?overlay=blue&theme=reboot&device=desktop&site=0&ver=4.7.5

try loading that and you will see errors...   namely a server 500 error... perhaps permissions?  or more likely, that your server is block the serving of php files as css...  generally allowed, but a few hosts block for unknown reasons...

you can tell this by a quick change to the SP CSS only theme... its a strictly css theme with no php...   you would make the switch on forum - themes - theme list...

if that is the case, you can contact your host or stick with a css only theme...  you are using reboot and the blue overlay (powered by php), we could probably generate a css version of that theme/overlay combo...