Help Why does the awake time keep increasing when charging through USB only?

[tagta3]

I've noticed that my awake time will keep going when EVO is charging through USB, but if I charge through AC adapter then awake time will stop like it should.

 

[sitlet]

I noticed this too after the update the other day.

 

[tagta3]

It's not from the update, I have not updated mine and it does it.