What brand were the items and did they relist them?
Louis Vuitton and yes they relisted them.
This might be the only time that I'll ever (sort of) defend a counterfeit seller. I don't know what happens on Poshmark when they remove a listing but if it's anything like Tradesy, sellers may not be told why their listings are removed.I think when listings are taken down they're not really reviewed by professional authenticators and it's just if they get a critical mass of complaints/reports. The authenticators only review items actually purchased over $500 that go to PM HQ before going to the buyer.
As I understand it, although Tradesy responds to reports of fakes and does remove listings, they don't let sellers know that the listing was even removed! So not only does the seller not know the reason, but if she has a lot of listings, she may not even be aware of the missing item.
If PM does something similar and simply removes items without notification to the seller, the seller might conceivably assume it was a glitch and relist.
(On ebay, when a listing is removed for an illegal, infringing or other violation of ebay policy, the seller gets a very specific email telling them WHY the listing was removed as well as a link to their policies.)