Do you have any other countermeasures on the fleet? And what range extenders are you using?
Without the Mortorheads crew you are looking at your anti missile range.
As a frame of reference, on my build with MDS3 and Countermeasure Loaders 4, Gale 4s should only have a range of 2 units longer than my normal anti missile range when using Mortorheads. The base ranges of MDS and Gales are far enough apart that the 30% extra range is needed to close the gap.
Without the Mortorheads crew you are looking at your anti missile range.
As a frame of reference, on my build with MDS3 and Countermeasure Loaders 4, Gale 4s should only have a range of 2 units longer than my normal anti missile range when using Mortorheads. The base ranges of MDS and Gales are far enough apart that the 30% extra range is needed to close the gap.
I assume that is what you are seeing as well.