Confirmed - Your XP bar stays at the same % when you Grant Levels.

I have a level 25 druid that i have been granting levels to from 1 from my 3x Mage team and I thought about this same thing the other night but I just though that i had gained XP on the druid from being summoned and discovery XP. I read this and decied to confim it. Here are my results

@ lvl 25 XP Bar 7116/28900 25% ( actually 24.62%)

granted 2 levels back to back

lvl 26 7509/30500 25% ( Actual 24.61%)

lvl 27 7927/32200 25% ( Actual 24.61)