Same dps with different gem level

Hi, I noticed that the dps showed in the skills tab doesn't change when swapping
gems of the same level with +1 or -1 level from corruption. The issue is not skill specific as it happens with more than one skill.

Here's what i tried:

lvl 17 -> lvl 18-1: dps increases
lvl 18-1 -> lvl 18: dps doesn't change
lvl 18 -> lvl 18+1: dps doesn't change


I don't know if this is only a visual bug or if the dps is actually bugged.

Bug Report ID: #65655032
P.S. in the bug report submitted in game I wrote that all three gems show the same dps while only the two lvl 18 do.