I have made a post about this on the subreddit but figured I should also make a post on the official forums as well.
How to reproduce: Overload fire and jump off edge immediately after the overload is finished. When you deploy your glider, your overload animation will stop immediately. However, shortly after (I’m talking like 1-2 seconds) your glider will retract on it’s own and you will either have to redeploy your glider or fall to your death.
This bug happens in both open PvE and Raid instances. Others in my original subreddit post noted that this was also happening with Druid’s Celestial Avatar.
You can find my subreddit post here: https://www.reddit.com/r/Guildwars2/comments/4q35l5/bug_with_tempest_overload_and_gliding?st=ipzurdgm&sh=1f040a9a
And here is a link to video proof: https://youtu.be/EgaH9pMjg9k