Just guessing here based on physics....New wedges = sharper grooves. Sharper grooves increase spin rate. Higher spin rate may lead to shorter distances with less roll out. With my game, I know when it is time to get new wedges when I cannot control the spin/rollout. Old wedges tend to roll out a bit more, while new wedges tend to drop/stop of backup a bit (not saying that it explains the entire 15m change).

I had that same problem with SM10 56m, so I went with theSM10 54m and upped the loft to 55, little more bounce but got the distance wanted. I also got a SM10 from Vokey SM10 54m and did the tour grind where they grind the ridge on the sole off, bent to 55 and got the bounce back to 8, just an idea for you

Normal? Maybe, maybe not. Worn grooves will spin less and launch higher. So if your old wedges roll out further as part of the increased distance, it shows that fresh groves make a difference.

My Golf Spy published their own study that 750 strokes of a wedge from a bunker result in a spin rate half of what it was when new. I wouldn’t go so far as saying new wedges aren’t as good as older worn wedges based on distance alone. Titleist’s recommendation of 75 rounds is roughly equivalent to 500 strikes between rounds and range work.