maybe try this [which is how I solved my prob]
make a copy of your preset.. this copy is purely for test purposes..
in the copy, strip everything but the amp and cab blocks, save and test scene switching
this should work perfectly
if it does not:
check your amp / cabs scene by scene, you are looking to see if they are X or Y, plus any changes in level settings in the blocks
check the level scene by scene in the grid output and make sure that it don't change
if it works perfectly, go back to your original preset, copy it over the top of your test copy, strip everything but the amp, cab and delay blocks and test again..
if that's good you copy over the copy again, and strip everything up amp, cab, delay and reverb blocks and test again..
you keep doing this until you find the rogue block or grid routing that's causing the issue
it's simply a matter of being systematic..
