Help with counter offer

[Dan Vleck]

I'm going back and forth on a house with a seller, Basis Investments LLC out of Bryan TX, who bought the house as a package a few years ago and let the house sit vacant and accrue assessments from sewer/water and street upgrades. After I made an initial offer of $73,000 seller pays assessments, my agent/sellers agent called saying that the seller is countering my offer by increasing it by $3000 and that the seller would pay the assessments of $25000. I accepted thinking I had the house. Now I find that my accepted counter offer was submitted as an offer and that the seller is now countering saying they will pay $19000 of the assessments. In other words, the sellers counter offer is $6000 higher than what I thought I was accepting as their counter. The dual agent says that any offer or counter offer has to go through various people at the LLC and that is likely why I'm having trouble. Should I just back out on this as a buy/hold as the house isn't valued much over 100,000 anyways. I just don't know if they will play fair anyways.