OK, if you're new first some terminology.
FTA (Free To Air) - can be viewed by any receiver without the use of a card. Has Now and Next programme information.
FTV (Free to View) - needs a card to be viewed (like $ly's subscription services) but it's a one-off purchase, not monthly.
Both above can apply to satellite and terrestrial transmissions.
Freesat - an FTA satellite service but with a special information stream that gives a seven day programme list and automatic channel/frequency change updating for certified Freesat receivers
Freeview - similar to Freesat except that it's a terrestrial service.
FSFS (FreesatfromSky) - this is the FTV service above which mixes in FTV channels with mostly FTA channels. This uses Sky's seven day programme list.
But then there's the Fortecstar! This isn't a certified Freesat receiver but it has a firmware patch which enables it to work almost like a proper one. Note "almost", not exactly! There's a problem at the moment with certain aspects of the Freesat emulation (I don't have the receiver myself but there are posts here about it) and what you describe may be another symptom.
Hope that helps to understand a bit more what's going on.