Excuse my lack of "specific" knowledge, but I believe it has to do with the "set effect" that comes from the Frozen Gear.
The reason it's telling you that the individual items decrease your range is because of the ATT and Stat boosts from wearing th…
"Oh wow! You are SO right OP! :O Everything you said was absolutely correct!"
You wish I was going to say that... but sadly that's why the above statement is in quotation marks.