Question Kubi. Deffect or I'm doing something wrong.

[Boarderguy]

Pull the wrist seal ring further out to allow the retaining ring to sit a bit deeper in the groove. I had this happen once after playing with the system. It was a pita having that happen with full kit on, but it was quickly corrected and hasn't happened since then. I took my wrist seals out a long time ago...

 

[Tassie_Rohan]

Your rings look normal from the photo: are you sure you are using the thinner larger ring on the left to secure the cuff (arrow below), and not the fatter central one?

I pulled out my cuff ring - there are two black o rings: a fatter 4.5 mm ring to hold the Si/latex seal (your middle ring above), and a thinner 3.5 mm ring to hold the assembly in place (your left ring above). The red ring is 5mm.

If the thinner ring is 4mm then you need to get the correct one - but it looks thin enough from your photo.

Cheers
Rohan.