Strange floating perspective at airports

I have one or two addon airports where perfectly stationary aircraft will appear (say) to be well to the left of a yellow marker line on the ground when viewed from the left, but on the right hand side of the same line when you pan round to see the a/c from the right-hand side. a/c seem to slew around a central point as you pan up and down or around them. A bit disconcerting...I have cured one instance (at Aerosoft's GCGM) by removing the file gom_5_01.bgl - which I assume is some sort of flatten file (?) but at other airports where this happens I can find no file which, when removed, cures the problem. Is it possible to fix this? A new flatten file often cures odd level problems, but this seems rather different..Thanks.Martin