I had the flight modes screwed up on one drone. It was in acro mode which I did not know. It would do the same thing for me go up about a foot and then flip over. So check your mode settings in Betaflight. Hope this helps.
Just got these and for the life of me I can't figure where the memory card goes. Point me in the right direction please. Just figured out where it goes. It was one of those "duh" moments.