On macOS in Vim, when you press a combination, something strange happens. How to fix it?

Question

vim

I have a completely clean macOS system (!) (specially reinstalled) in the Vim text editor with Vundle and Vim-colorschemes, Vim-misc, vim-colorscheme-switcher installed, when I press a key combination Shift + F8, the case for the leading characters is changed to the opposite. And here, for example, here: https://youtu.be/baDKp_--DqE?t=140 it is clearly stated and shown (!) that the change theme change function works properly, but I don’t... And the most interesting thing is that if you get into the vim-colorscheme-switcher configuration file and change the key combination from Shift + F8to, for example, F7then everything just works wonderfully.

Good people, tell me, please, where can I change these settings so that everything works like in that video.

PS Specially checked the performance on the Raspberry Pi 4 and everything worked fine. Good people, please tell me what to do and where to look for the config! How to deal with it? :(