The wording on the chest descriptions correctly say that you will obtain a Quality 2 5-star gem but the wording on the selection screen (where you choose the six gems you’ll get one of) says you’ll get a Quality 5 gem.
So, yes, you’re getting what you’re supposed to, i.e. a Quality 2 gem, but support should absolutely be aware that the game is giving misleading information that the developers need to fix.
This was reported weeks / months ago, and they haven’t fixed the wording on the selection screen.