Inside your @506th folder, there's a Userconfig folder. Move that folder back to your main Arma3 directory.
If, inside @506th, you have another @506th, move the files from Arma 3\@506th\@506th to just Arma3\@506th - if that makes sense.
Your final folder structure should be Arma 3\@506th\Addons rather than Arma 3\@506th\@506th\Addons
And this applies to all of your mod folders - make sure inside the @ModName folder, the very next level is an Addons folder, rather than more @ folders.