I have a server running on aternos, All plugins work... EXCEPT WorldGaurd (previously working)
It allows the commands, creation of a region, etc but the flags do not function. it lets you set them but won't enforce them.
I would check to ensure you have version WorldGuard 7.0.1 or a version that is confirmed to work with Minecraft 1.14 fully.
Command Panels, Fully Custom GUIs. You can make GUIs using Custom Software.