Windows key isn't pressed but every key I press with left ctrl acts as if I was pressing the windows key as well.
E.g. if I press left ctrl + C, it does ctrl + win + c (the colour filters toggle), so I can't copy and paste.
Not sure what I did to enable this or whether it's a problem with the keyboard itself. I was just typed and it suddenly started happening so I could've pressed a combination that enabled it.