Your 26E "Satellite" is just a simple data table: If you select 26E and the dish duly moves there, then you scan, you will easily pick up 28E when you scan "26E" as the 28E signals are so very strong and because your small dish cannot easily discriminate.
A bigger dish can discriminate better, but even 90cm or 1m dishes (which naturally have narrower beamwidth) in UK and France are tricky to set up to get 26E whilst also rejecting 28E.
Believe me, if BBC and ITV were on 26E, the whole Satellite world would know and most of our Forum debates would be irrelevant.