Spectrum wrote:
it used to happen to me, then I realized it was auto fill that was changing it so it could be that for you.
That could indeed be it, I had a constant issue where my username would change to be be lowercase, something that would only changed after I wiped and re added the username and password to the auto fill on my password manager. It was confusing me a lot when I was figuring out why it was happening... Super odd behaviour.