It seems like the problem is with the will and identification of this Calvert Co MD man with Martha who m. Wm Moseley and George Taylor, not the deed, although I suppose it depends on the perspective. The person who wrote this will doesn't even mention anybody named Martha. The only person named Brashieur at all is his "Couzen Mary Brashieur". That's a lot of kids that Brasseur-19 has, to have a will mentioning nobody with his surname. Seems like there is some conflation in that profile. Here is the will https://www.familysearch.org/ark:/61903/3:1:3Q9M-C914-L4FM-8?i=131&cat=259693
Here is a profile, which has a trans. of the deed, and asserts that the Robert who was her father was married to Florence and died in Isle of Wight Co.
https://www.colonial-settlers-md-va.us/getperson.php?personID=I82470&tree=Tree1
(a) we see no probate for him in Isle of Wight and (b) the deed seems to suggest he could have died in Nansemond, which county's records were burned... maybe that's where the will was?
EDIT: N.b., having studied George Taylor, Martha's other husband, I would just point out that he has a wife missing on Wikitree and on the above mentioned site, who was Martha Tomlin, which means he had two wives named Martha. To be specific:
* Martha (Tomlin) (Jones) Taylor was living (as George Taylor's wife) on 7 March 1683 when her brother Robert Tomlin executed his last will.
* Martha (Brasseur) (Moseley) was married to George Taylor by 2 October 1684 (Old Rappahannock OB 1683-5:44, in which George Taylor is married to Martha, William Moseley's widow).
... and unlike the Richard Alsop matter that I have been dragging my feet on, in this case I do have notes I can give you, if you are interested. They've been lying around waiting for me to formalize them and start disputing things with PMs, etc.