ive made two posts on here about this and a reddit post on r/destinythegame on this bug and i wont stop until i see it fixed.
On console and in DestinyItemManager, the stability bonus appears to be broken on compare, and on pc, both bonuses are broken on compare.
how this compares to how the gun feels however, i cannot say for sure.
but something is definitely bugged.
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I believe this is just a visual issue on compare. It has been around since the catalyst became available in season 3.