One vs. two o-rings in light head?

[Phenol]

This may seem like an odd question, but has anyone seen / used lights that have two thin o-rings instead of one large one, in the same groove, in a screw-in light head?

I sent in a Pelican Nemo 4C for servicing (bulb/circuitry problem), and got it back no questions asked. However, while the original light head was sealed with one tick o-ring, the one I got back had two thin ones that the light head is supposed to squeeze down on. I've had lights with double o-rings, but each was in its own groove. This one just seems odd, and I hesitate to bring it in the water. Am I making too much of this?

Thanks for any comments...

 

[Packhorse]

2 thins O rings will not seal in a groove designed for 1 thick one.
Are you sure its not a single X ring? ( if thats the correct term?)

 

[Phenol]

2 thins O rings will not seal in a groove designed for 1 thick one.
Are you sure its not a single X ring? ( if thats the correct term?)

I googled "x-ring" and that's not it: it's two single o-rings, about 1.5 mm thick and 50-60 mm diameter, one on top of each other.

Unless I hear otherwise from Pelican (new design? mistake?) I think I'll return it.