Sugar Pumpkins

I just tried cooking two sugar pumpkins from my garden. The first one was super stringy and weird. I’ve cooked a lot of sugar pumpkins, so I know this isn’t what it should look like. I figured the first one was an anomaly, so I cut another one. It was exactly like the first one when I cut it open. The rind was really hard to cut through, it was slightly green, and looks a little porous. Did they not grow long enough? Too long? Did they cross pollinate with the other pumpkins? TIA!