Everytime I try to buy a CW and it asks for my password to buy the item it says "Incorrect Password". And I even logged out and back in, plus changed my password to try and help. :(

Some CWs have a password set by the creator to limit who's able to buy them. The shop is asking for that specific password, not your account password.

Sometimes users will set a password because certain people are still picking up their requested copies (especially if a release is limited) or they might be asking for people to request an invite so that someone can't buy multiple pairs to resell, etc. If the user doesn't have a note in their CW shop about not asking for passwords, you could try messaging them to see if you can get an invite for the item you want