Does the address in your watch only wallet (the address your bitcoin are now on) match the address printed on your paper wallet?
Does your watch only wallet which contains your bitcoin only show the one address they are on, or does it show many addresses?

It sounds like you have imported a single address from somewhere and then swept your paper wallet to it. You need to figure out where you copied that address from, as without doing that, you will not be able to access the coins.