Maybe it's something stupid on my side, or maybe a known problem but I couldn't find it with a search.

I've made a few new custom usergroups, let's call them:
Football Members
Racing Members

Now my problem is this.
When editting usergroups, in Football Members appears the "Viewable on Show Groups?" question but this complete line is not showing when editing Racing Members.

It's also not showing in some other usergroups like the standard "registered members".
But it is showing "Administrators". So in some groups it is showing in others it's not.

I'm running 2.2.6 at the moment (not long ago upgraded from 2.2.5) and I would appreciate if this one could be fixed without having to upgrade to 2.2.7.

Can anyone help?