Although it is possible that Scots Peerage made an error, it is not likely that Marjorie married both the 7th and 8th Earls.
The Scots Peerage : Founded On Wood's Ed. Of Sir Robert Douglas's Peerage Of Scotland; Containing An Historical And Genealogical Account Of The Nobility Of That Kingdom : Paul, James Balfour, Sir, 1846-1931 : Free Download, Borrow, And Streaming : Internet Archive". 2020. Internet Archive.Malise 8th Earl, Vol VIII, pps 252-4
The Scots Peerage : Founded On Wood's Ed. Of Sir Robert Douglas's Peerage Of Scotland; Containing An Historical And Genealogical Account Of The Nobility Of That Kingdom : Paul, James Balfour, Sir, 1846-1931 : Free Download, Borrow, And Streaming : Internet Archive". 2020. Internet Archive.Marjorie Ross, Vol. II, pg 320.
The Complete Peerage numbers her spouse as Malise VIII Earl and lists Marjory as follows..marr. c 1325-8 dau. of Hugh, Earl of Ross by Maud, sister of Robert I, King of Scotland.
The Complete Peerage : Or A History Of The House Of Lords And All Its Members From The Earliest Times; V. 12 - Viewer". 2020. Familysearch.Org. Complete Peerage, FS, Vol 12/1, pps 394-5
Sources
See Also:
Complete Peerage, 2nd edn, Vol. 12 pt. 1 (1953), ed. White, p. 385, VIII.
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Margery has two spouses with the same exact name, but with very different dates. I'm not certain if these are the same people or if one is attached incorrectly. Just wanted to bring it to the PMs attention in case you have more information : )
Balfour Paul, Scots Peerage, Vol. 8, p. 254.
Also Vol. 2, p. 320.
Didn't marry Strathearn-32