On FamilyTree DNA, I have a match who is very clearly from my paternal grandfather's side. I am a male myself and thought it was only possible to have X-DNA matches on my mother's side. I thought my inheritance of X chromosomes follows the following pattern.

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    How large is the X segment that matches? Small segments could match by chance, and FTDNA does not filter out small segments that probably ought to be ignored. – Harry V. Jun 16 '20 at 4:26
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    Could there be two paths to reach your match? The "obvious" one and another via the maternal lineage? – AdrianB38 Jun 16 '20 at 8:34

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