Log in issues

These apps make no sense when it comes to logging in.
I have Runtastic on my iPhone
I have Runtastic Legs on my iPad
It WONT ALLOW me to use the same email or password! Is it NOT the same developers?
Stupid stupid stupid.
I tried logging out of iPhone app and go to iPad app, doesnt work.
Tried to contact support but there is no where to send a simple question. Frustrating!!!

Denarcy3 about Runtastic Leg Trainer Workouts, v2.5.2