You installed LSH 5.1 directly over GWX? Not a good idea. I'd be surprised if it didn't create a conflict. How to fix? Uninstall SH3, delete everything associated with the current install, including the SH3 folder in your Documents folder, run a good cleaner like CCleaner, reinstall. It looks like you might have SH3 Commander installed too, I would do the same with that. I would also change the mod install order if using GWX again. Start with the GWX mods first, then add the others, one at a time, with the exception of one, GWX Contact Color. That I install last, after the Supplement to V16B1.
Btw, did you know you can have multiple copies of SH3 on your computer?