I am having an issue with my Mobile login. No matter what username, password and authentication I use, it will only log me into one account. Even when all the information does not match that particular account.
Try this: log into the game then FULLY log out.
The full log out process starts by clicking on the door and selecting "Tap here to logout".
On the next screen, select "Sign out"
On the next screen, select "Yes"
This is the full logout and takes you back to the login screen where you see two options:
* continue with Google (or Game Centre if iOS)
* continue with RuneScape account
Which one of these options do you normally select?
Do you normally use a shortcut login or the full email/password login?