Hey /u/Frostyy_Gamer, as others have commented this is a known issue that should be temporary for a match or two. If you find your Bars not returning after a couple matches, please let me know.

Note: in competitive tournaments and Arena mode your persistent stash of Bars is not available.

Cam_ofblades

Do they come back if you go back to pubs?

Yes, they're only unavailable in Arena - not wiped/reset.