Does this mean what I think it means? The variance in my lineage must be pretty recent!

I am as sure as I can be that my own research is sound - all facts researched in person, each fact triple-verified... and now we have this.

I know posting this in a public opens this question up to uninformed speculation... I am hoping to hear from those who HAVE experienced this. Did it resolve with by waiting for more matches? I only wish to hear from those who HAVE experienced this, or from those who are geneticists or genealogists.