http://wiki.guildwars2.com/wiki/Versatile_Power
It appears this minor trait from discipline will cause any burst skills currently recharging from use to have an additional second added to the recharge timer when you go from the not usable version of the burst skill to the 10 adrenaline level 1 burst.
Example – Combustive shot has 4 seconds left to recharge and I use signet of fury then recharge timer will increase to 5 seconds.
This bug only appears when traited with Versatile Power and going from 0-9 adrenaline to 10 adrenaline and “unlocking” the first level burst. It does not appear to trigger on the change from level 1 into 2 burst or the 2 into 3 changes.