Sean Webster Hopefully others might have more helpful information, but I thought I'd chime in with my very limited experience with this. Like you, I purchased two parcels in Florida from the same seller who had inherited them, almost exactly a year prior in his case. I closed through a title company on a warranty deed, though, as opposed to self-closing, so unfortunately I don't know all of the details, but part-way through the closing process, the title company I had hired contacted me and let me know that the closing costs would "unfortunately" come in $200+ higher than they had originally quoted me. They said this was because some additional probate paperwork had to be recorded with the county to clear up the title for my purchase. They claimed this cost was mostly due to the substantial number of additional pages that needed to be recorded (priced per page), plus an additional courier fee, I think, to get the docs sent in from the out-of-state owner. I honestly was a little skeptical, but was far enough along with the closing that I wasn't going to start over with a different title company over a couple hundred bucks, either way.
The closing company handled it all directly with the seller and walked them through whatever docs needed to be executed and recorded. They only involved me to the point of verifying whether I was going to cover the cost or if I wanted to renegotiate it with the Seller (I covered it). Whatever they did must have worked out okay because I resold the property through a title company on a warranty deed a month later.
Assuming your buyer chose the title company, is there any reason they (title company) wouldn't walk you through whatever documents are needed? Unfortunately, I'm guessing you might need assistance from the seller you bought from, to produce the docs, so hopefully they're responsive, but at the very least the title company ought to walk you through what's needed, I would think.