Not sure how humidity would matter as far as scuffing.

Which system is being used on your floor?

The AMOUNT of finish (2 coats vs. three) will be more the culprit. And the TYPE of finish (matte, satin, semi-gloss, gloss) will also cause scuffs to be MORE visible (ie. a shiny floor shows 'dull scuff's more than a satin...whereas a matte finish can show shiny scuffs more than semi-gloss).

And the COLOUR of the floor will also enhance the look of scuffs. And to be clear, a 'scuff' is defined as material left behind.....not a scratch. Scratching (something piercing the finish causing a break break that can be felt with a finger) is more likely to occur with a poorly finished/poorly cured product. Scuffing is normally a problem with things moving across the floor.

Remember gym class? We weren't allowed to wear black soled gym shoes? Why? Because of the black scuffs they made. Black marks. Marks left behind from our shoes. Those scuffs were easily removed (large pink erasures were our janitors' best friends...just like on the butts of a pencil)...but an entire gym class of black soled shoes could cause a week's worth of work for the janitorial crew. And therefore these soles were banned.

Move to a home setting. White soled shoes can leave 'clear' looking scuffs. Black soled cause black or dark scuffs. Roller wheels on a desk chair = scuffs. Plastic feet on dining room chairs = scuffs AND scratches.

Do you have photos of what you are trying to describe? Scuffs are different from scratches. So I'm wondering if you are trying to say your floor was easily scratched vs. scuffed.

And yes...what was the product used the first time and how many coats were used?

In my experience, waterborne urethanes mar more easily than oil based, acid curing or moisture curing. The humidity might have affected your finish but I suspect it's not the reason for your scuffs, and it probably isn't realistic to expect the same finish to perform much better the second time around.

mjkearns1 , has your floor finisher provided the steps and humidity levels they collected during the process?

Thank you all for your expert comments. They are scuffs, not scratches. The humidity level in the crawl space was in low 60s and 40s in the house. It has leveled off both in the house and crawl space to mid to high 30s. The wood planks have been measured to watch the drop in moisture content for the last few months. We are stripping the finish and sanding and going to do it again. Meanwhile as the wood dried, the cupping substantially lowered. We have sensors in the house and the crawl space to monitor the humidity at all times. I want to believe the level of humidity never allowed the floor finish to cure properly thus causing easy scuffing.

What was the finish? What was the gloss level? What was the application time? How many coats? Time between coats, etc?