The squash you bought was cross pollinated with another type from the same family that was likely growing in the same field. There are 3 families- pepo, maxima, moschata. If you’re growing for seeds you either need to only plant one variety from each family or use mesh bags to cover female flower buds and remove the bag and hand pollinate when they open. Keep the bag on for a day or so after pollination.

Here in Minnesota, there are years when my acorn squash are totally yellow or orange when harvested.
This from a squash that’s normally dark green!
This appears to only happen when it’s a dry year, hotter than normal, and I get a late season frost.
No worries! Yours will taste as good if not better than last year’s crop!

I bought a winter squash last year that was very tasty, so thought I want to grow some of it this summer. I put them in the soil and they are growing… BUT!

The last year squash that the seeds came from, was greenish/grey to the color. My squash that are growing in the garden are more like orange. How is that possible? Do you know what could have happened?