How did it bug TFA Base? Because this has no Lua (yet), so it should not have bug anything, just addons that depend on default HL2 models (that is the disadvantage of model replacements)

my guess is this addon bugged the addon that replaces the normal default pistol with the TFA usp [if you have it] which might've bugged your TFA stuff as a whole. it might be best to get rid of any TFA stuff that messes with the default weapons so you can actually use TFA addons, hope this helps.