It's not really a glitch, but I think you only use bold settings once when you made it, then it goes back to normal. Imgflip didn't blew it off on text settings.
I ONCE MADE A TEMPLATE AND MADE THE TEXT IN BOLD AND I SAVED THE TEXT BOX SETTINGS; BUT WHEN I COME BACK TO IT THE TEXT ISN'T IN BOLD ANYMORE, IS IT A GLITCH