Mod Calibration Question

Hello SWGOH,

I have a question on the mechanics of Mod Calibration. I feel like I roll the same stat about 75% of the time when burning through my attenuators and was curious if there was something I was missing. When I brought it up in my guild discord it seemed like everyone had a similar experience. Statistically, assuming an equal chance for each stat, you should only get the same stat 25% of the time (33% if you have 5 stacks of a stat).

Someone mentioned that it might be that when you roll a flat stat (offense) and there are only %stats (offense%) available... your chances are lower, almost as if there is a rarity attached to the stat type. Though I have no evidence of this it kinda makes sense as I almost always try to roll the flat stats. Or maybe having multiple stacks of the same stat gives you a lower percentage?

Is there something I am doing wrong? Do you guys usually roll the same stat when calibrating?

Thank you in advance!