My suport ticket request on the same case was closed without any reply.
Same thing happened to mine too. The magnets just came out of the plastic nibs that mount to the pi board. I think they forgot to glue them into the plastic.
I just used a little glue to secure them back in and I haven't had an issue since.
seems the mag clips will not fit into the pi3 motherboard ? any ideas ?
solved mag clip install today on pi3 with gentle plier squeeze, seemed to do the trick and now all 4 mag clips installed ok into motherboard and pi3 now in pi-top on mag rail