Why do sellers block?

I made an offer I thought was fair based on item value and seller pricing; they countered with an offer that I wasn’t ready to purchase at so I just declined straight away so as not to waste their time. I went back today having had time to think on the items, ready to make a higher offer, and it appears they have blocked me. I can’t offer or comment on the bundle, nor am I able to contact the seller in any other way. Am I missing some Poshmark etiquette here? I never made any rude comments or anything and I didn’t even make a crazy low offer… I’m so confused! If you’re selling red Birkenstocks and a silver down puffer and you see this please unblock me sis!