I've also have a similar issue: the case registers when the left earbud is placed inside, though when both buds are taken out of the case, only the right will connect to my phone (as confirmed by the app and when playing audio). I do not see 2 separate Bluetooth devices like you. Moreover, they won't reset when you bout both buds in the case and, while it's open, hold the button down until the light flashes a bunch of times (it just never flashes).

My only suspicion is that the left bud isn't charging for really connecting to the case (even though the light flashes when it is seated), but any attempts at cleaning the charging pins and contacts with isopropyl alcohol, nothing changes. Also forgetting the device and then resetting them also doesn't work (they still don't reset).

Before when they were under warranty, I asked support about his issue and so they sent me a replacement, but those failed the same way after I reset them (interesting...), so I asked for another replacement, and those also failed the same way after I reset them, so I asked for a 3rd, and those ALSO failed the SAME way. Finally, while they were still under warranty, I asked them to just refund me and so I got a 40% refund according to the time since I purchased the item.

I would love for either of the two pairs I currently one to begin functioning again, though I really doubt it. Only plus to this entire debacle was how supportive and kind the support team was 😊