Hello and welcome to the Moor!
Far as I'm aware they go under the normal marketplace if they are standard silicone toys.
After that you just chose between individual listings and the group listings for more than 5 toys.
I'd say it's the nicer thing to simply list under the group sales if...
Ah that's a shame :/ I can only imagine how upsetting that can be.
While I haven't ventured into the reddit listings much to say it's not common there, I'd say from what I've seen across all markets, is it comes and goes everywhere. So hopefully, but no less disappointing, is it's just bad luck.