Level 10 Freelancer ability broken?

It looks like the Level 10 Freelancer ability that shows how many chests are on the map might be bugged or not updating correctly (at least sometimes).

Here's what happened:

- It initially showed 3 silver and 3 bronze chests.
- I opened a bronze chest.
- It still showed 3 silver and 3 bronze.
- I opened another bronze.
- Still showed 3 silver and 3 bronze.
- Then I opened a silver chest.

after opening the silver it update to show 2 silver and 2 bronze??

There were about 5-10 minutes between all these actions.
I didn't do any CEs, FATEs, or kill any mobs during that time.