First of all, our users will never lose their earnings (unless they deactivate their accounts). This typically happens because you logged in with using Facebook login while you have previously been using email login (or vice versa).
So, if you originally signed up on Slidejoy through Facebook you should use Facebook login. If you did not, you should use the email you originally used when you signed up with Slidejoy.
Please try logging out and logging back in with your original sign up method.