Sir,

Looking at your first photos what I see in not a run. I am seeing one yarn that is thicker than the rest. This does sometimes happen in weaving.

Yes, it is a flaw in the fabric. but does not weaken the fabric and should not shorten the fabrics' lifespan. It is unsightly to our eyes though.

We seem to expect perfection with today's weaving but at the same time revere the older, hand woven fabrics where flaws like this, along with floats and slubs, were common.

This type of flaw is far less common today, than even 50 years ago. In days past it was the practice to mark such flaws in the fabric with a string of a contrasting color knotted into the selvedge edge of the fabric. This would alert the cutter to where the flaws were so he could plan his cuts around the flaws. When fine tailors went to buy fabric, to insure that what they were buying would not contain these little surprises, they would specify fabric "With no strings attached".