Malise Strathearn, Earl of Orkney, Strathearn, and Caithness - Same age as their parents.

(from the about, source is fmg):

JOAN de Menteith (-after 21 Mar 1367). [95]m firstly ([1323]%29 as his second wife, MALISE Earl of Strathearn, son of MALISE 6th Earl of Strathearn & his wife Agnes Comyn of Buchan ([1275/80]-before 1329).

[96]m secondly JOHN Campbell Earl of Atholl, son of Sir NEIL Campbell of Lochow & his wife --- ([1305/06] or [1313]-killed in battle Halidon Hill 19 Jul 1333).

[97]m thirdly (dispensation 11 Jul 1339) Sir MAURICE Moray of Drumsargard, son of Sir JOHN Moray of Drumsagard & his first wife --- (-killed in battle Neville's Cross 17 Oct 1346). He was created Earl of Strathearn 9 Feb 1344.

[98]m fourthly (post-nuptial dispensation 9 Nov 1347) as his second wife, WILLIAM Sutherland 5th Earl of Sutherland, son of KENNETH Sutherland 4th Earl of Sutherland & his wife [Mary or Marjorie of Atholl] (-before 19 Jun 1371).

Okay, now for Agnes Comyn:

...............................

(Sorry, that's all I could find there, lol.)

From his father's overview:

Note: Malise, 7th Earl of Strathearn was born between 1275 and 1280.2 He married Agnes.3 He married Joan Menteith, daughter of Sir John Menteith, circa 1323.1 He died before 1329.2 He died before 1320.3 Malise, 7th Earl of Strathearn gained the title of Earl of Strathearn.1

Family 1 Agnes d. after 1311 Child Malise, 8th Earl of Strathearn+ b. c 1290, d. bt 1344 - 13572

Family 2 Joan Menteith b. before 1315, d. after 1367

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From the overview for this profile under discussion (no birth date):

i) MALISE (-killed in battle Neville´s Cross 17 Oct 1346). He succeeded his father as Earl of Strathearn. He succeeded his cousin Magnus as Earl of Caithness and Orkney in [1323/29]. He resigned the earldom of Strathearn [24 Sep/16 Dec] 1332 into the hands of Edward Balliol...

[736]m firstly MARY, daughter of ---.

m secondly ([1325/28]%29 MATILDA [Marjory] of Ross, daughter of HUGH Earl of Ross & his first wife Matilda Bruce (-after 1350).

Earl Malise & his FIRST wife had four [daughters]:

(The first wife, mother of the four daughters, missing here. The daughters are being attributed to the second wife, Marjory Ross.)

So it appears they only need a few minor adjustments to make the red-flag inconsistency go away.

Malise Strathearn, Earl of Orkney, Strathearn, and Caithness is your 13th cousin 10 times removed.
Maurice Moray, Earl of Strathearn is your 14th cousin 9 times removed.
Joan Menteith is your 12th cousin 11 times removed.
Mary of Strathearn is your 13th cousin 10 times removed.
Malise, 7th Earl of Strathearn is your 12th cousin 11 times removed.
William Sutherland, 5th Earl of Sutherland is your 13th cousin 12 times removed.
Agnes Comyn is your 12th cousin 11 times removed.
Helen de Strathearn is your 13th cousin 10 times removed.