On the other community board, I see your question posted, without any answers.
If you're looking for a response from rover, I'd suggest contact them directly.
On a side point, you may choose to change wording (mostly at meet & greet while you're observing how dog reacts unleashed in your home & if dog has tendency to mark, but you may consider profile too) a bit more to get matched with the right pups for you.
You clearly state House Trained dogs only. Based on the review, this pup wasn't a fit because it was Marking.
Generally, those are 2 totally different things. House Trained referring to going to the bathroom outside when need to eliminate. Whereas, Marking isn't usually driven by the need to eliminate - that's more of a behavioral issue.