The answer to your specific question is fairly simple: "Because they don't know better."
But once you know better, what do you do? I took a look at the profiles and there is extensive work remaining to be done. There seem to be several duplicates of the Virginia Matthew Strickland and all of them married to duplicate Elizabeth Loreens. Since these profiles are of interest to you, here is what I would propose you do:
1. Since there are two Matthew Stricklands, but only one Elizabeth Loreen (once merges are accomplished), I'd suggest you start with Elizabeth. Ask to be on the trusted list of the various Elizabeth Loreens and choose one to work on. If the profile manager is active, coordinate with the profile manager.
2. Get the well sourced information you clearly have, and enter it on Elizabeth Loreen's biography just as you have in your initial note. For the remaining Elizabeth Loreens, proposes that they be merged into your Maryland Elizabeth, or have their LNAB changed to Elizabeth Unknown, the Virginia Elizabeth.
3. All of the Matthew Stricklands at present appear to be the Virginia Matthew. By the time you have finished work on Elizabeth it may be clear that one of them can be re-purposed, in coordination with its profile manager, to be the Maryland Matthew. Or it may be simpler to create a new Maryland Matthew from scratch. Because of your work on Elizabeth, you will have sufficient good sourcing to justify doing that. Standards for creating a pre-1700 profile are higher and you should not do it if you only have Ancestry or other unsourced information to work with. You may want to include a Research Notes section explaining why the Maryland couple are different from the Virginia couple.
4. Once you have a good Maryland Elizabeth and Matthew -- they're the simple ones because they have no children to worry about -- consider all the remaining ones Virginia ones. Propose merges for the ones that are duplicates, and make sure none of the Virginia Elizabeth's have a last name of Loreen.
5. Stay on the trusted list of your Maryland couple. If you discover in the future someone else trying to turn them into the Virginia couple, request that the Maryland couple be Project Protected. That will prevent most people from being able to change the LNAB or adding relatives who don't belong there.