question regarding "Sale Date" and "Recording Date" on List Source.

I have a question regarding "Sale Date" and "Recording Date" on List Source.

In Listsource.com

I put in the criteria
(A) Last Market Sale Date between 1/1/1900 to 1/1/2000
The number of entries I got is 209

(B) However if I do a Last Market Recording Date between 1/1/1900 to 1/1/2000
The number of entries I got is 513

I am a bit confused about this, since I thought (B) should be a subset of (A)
so (A) should give me more entries but it is not.

e.g. Someone can purchase a property in 1980 and that is group A)
If that person re-fi, that would belong to Group (A) and Group (B)
However, not everyone in Group (A) would refi, so group (A) should be larger

Anyway, I am trying to locate properties that were Sold before 1/1/2000
What criteria should I use? "Last Market Sale Date" or "Last Market Recording Date"

Another questions.

If a property is purchased in 1970 by the father and the father died
and the son inherited the property in 1999, will that appear in the search result of (A) or (B)
or both under listsource.com?

Thanks!