Cool, that is the 'shorter' (due to cap design) version I mentioned that is delivered with the Oont and seems to be the new design for the caps going forward.
So are you having the metal oven fall out even after clicking locked into place(the video was a bit fast paced, sit the unit on the desk and slowly press hard, not fast, like my video as it looks like you are still not seating the oven properly to start with)?
If you are still having the oven fall out, you can start a RMA here,
support@xvape.com
or,
Call our offices:
Monday - Friday 10am to 4pm PST
(909)517-1100
Let us know how you go as Head Office may need a video etc as this is the first we have heard of the S/S retainer not doing its job (I only have about 500 puffs on my newer S/S retained version in the video posted above and can carry my device by the S/S oven and it stays put, see below).
edit for new capsule info