Commanders,
We have received reports that some players see changes to the XP bar and base level after upgrading buildings.
XP Bar Filling Animation
Some players have reported that after upgrading a building the XP bar fills up, depletes and starts filling again. This animation keeps looping until another building is upgraded. This is a visual issue only. If you check the XP bar in the profile screen, it states what your current XP is and does not change.
Base Leveled Up, Then Back Down
We have received a couple of these reports and have been trying to recreate the issue. We have discovered that some buildings will complete an upgrade, and even though they grant 0 XP, the XP bar changes and sometimes shows the base going to the next level up. Then after a refresh of the game, it updates to show the correct XP and back down to the lower level.
This is also just a visual issue. The correct XP and level are there, which is why a refresh shows the lower level, this is what you are supposed to be at. We are working on fixing the issue of XP temporarily adding by mistake. You can see what XP you will get in the building upgrade screen, shown in the following example.