This issue is with the skill Mimic and its effect, Echo. I normally experience this when running Veil with Mimic in WvW. The issue is that when I use Mimic, and then use Veil, Veil is recharged in 1 second, BUT if I change that 1-second-recharged Veil to another skill, that skill has a massive recharge.
To replicate:
1) Equip Mimic
2) Equip Veil in separate utility slot
3) Use Mimic
4) Within 9 seconds of activating Mimic, use Veil
5) Wait 1 second for Veil to recharge
6) Change the utility slot which Veil is in to something else (i.e., Portal)