I agree with others it's very common usually from foot traffic & soiling
Bout once a year i'll get one and the owner theorizes the their must have been a water leak in the bathroom/ laundry room ?
See it on wool w/w too cleaned a room size Kashan 12x18 or so laying on carpet awhile back customer calls calming we delivered the rug back wet because the funny texture change on his wool carpet. The pooling went from one end of the house to the other up stairs down the hall and all the way into the master bedroom closet
when do we get to see the after pics
