I have a mono bus . Mono Interleave enabled
On that bus at the end of the FX chain is 
1) Fet comp 
then
2)L1 Ultra Maximizer at the end
 
this shows a single white line in between these plugins  in the fx bin = mono
 
if i swap 1 and 2 so L1 is on top of the Fet Comp there are 2 white lines in the FX bin = stereo ( i dont know why but this is not the problem )
 
The problem is that when i put 1 then 2 in my fx bin then save the project > when i open it the bus changes them back around so in the re opened project > the mono bus in question has L1 then Fet comp last .
 
Why is it changing my fx bin ?