I did disable it at that airport i even removed AES?
Strange, I surely don't think the scenery was made like that, something is still excluding its original jetways.
in any case, it's not really a GSX issue, you need to find the .BGL that is excluding the jetways. I still think the most likely cause is the AES Scenery Area layer that is doing this, since it looks like a precise exclusion of jetways only (which is what AES does), rather than a generic AFCAD conflict, that removes things at random.
also i have just gone to another 3rd party airport MKJP and i choose a Heavy gate and its saying the parking space is to small and i have tried every gate?
Regardless of how the parking space is labeled, it doesn't really matter, what counts is the Parking Radius that have been specified in the AFCAD of that airport. GSX just look at that one, and compares it with half of the wingspan of your own airplane, and if the parking radius is smaller, it will say that parking is too small for your airplane.
GSX can't obviously know if that parking space really has "space", and the scenery developer put a smaller radius for some specific reason, or the parking is *really* small, so it can't have any other choice than to take the information about the radius found in the AFCAD to be correct.
Of course, you can fix all parking spot radius quite easily with AFCAD editing tools, like ADE or AFX.