12524 H 27500 works on Skybox but not Tevion

Hi

I bought the Tevion Satellite combo From ALDI for a spare room for Gran (the big one, not the Camper one). I installed it and pointed at 28.2-28.5. I can tune and get most channels needed (Propeller channel tested, + Sky News etc etc). My Gran wants to get EWTN on this. When I manually add transponder 12524 H 27500 the signal bar goes pale and quality goes to 0%. So I remove the Tevion box, and plug in an old Skybox into the same satellite dish + TV. I get EWTN no problem. I then cross check, by selecting Add Channel on the sky box, and select 12524 H 27500 and there she is EWTN and some other channels listed. So, I've got it pointed in the right direction, but have no clue why the ALDI Tevion Box cannot tune this transponder and does not pick up a signal, but works fine for others.

Any ideas?

Thanks in advance, folks.