At this point, before wiping the OS, I would be careful to make sure that what's going on is not some weird hardware issue.
When something like this happens, the first thing I typically do is verify that the system can be made to work correctly via an alternate means. For example, boot up using an old Windows startup disk & opening up text editor to verify that texting works as it should. (This verifies the hardware & pins it to the software that is causing the issue.)
(A simpler possibility might be to enter BIOS & try the KB there, but off hand Im not aware of any BIOS functions that Ive had in the past which used those affected keys [except possibly the /], but you could look.)
Puppy Linux would do nicely for such test (as it has a nice text editor built in) and doesnt need to be installed on the HDD.
Does Win 10 have a safe mode ? If so what happens with the KB then ? (Generally USB drivers used to not load in safe mode, but Win 10 may have an option for it.)
Found this:
http://www.techspot.com/community/topics/keyboard-characters-mixed-up-not-a-hardware-problem.20339/
Ya, looks like you have an OS issue (key map issue).
PS: As a long shot, go into control panel - keyboard and change the "repeat speed" setting. Slow the speed & see what happens.
Home » Software » 5 Tools to Move and Remap Keys on Your Keyboard
5 Tools to Move and Remap Keys on Your Keyboard
https://www.raymond.cc/blog/make-certain-keys-on-a-keyboard-to-act-like-other-keys/