Possible to get more than 100% on an artifact

I had an artifact leveled to 39% before the patch that changed from 100 realm levels per artifact to 20 realm levels per artifact.

I just spent the time to level it the rest of the way. It still leveled 5% at a time until it reached 99%…then after completing level 20 it went to 104%.

Screenshot attached.

Probably the game only recognizes the artifact to be unupgradable when it passes 99. Since you where at 39, and went up 5 by 5, the artifact only became “complete” after passing 99.