My ‘Just for you’ shop has been the same three bundles for the past 5 weeks or so, just two mercy bundles and a mei one. The only time it has changed once was when it replaced a mercy bundle with the monster Junkrat one, and then immediately went back to those three bundles after the shop refresh. Is it bugged? Please help if so, thank you 
Replying to affirm that this seems to be an “unofficially known” issue (encountered, observed and reported by multiple players, but not acknowledged on the official “Known Issues” topic.) And, replying to consolidate links for reference…
As of this post, this issue unfortunately is still present and impacting players (at least, some of us - myself included).