Jackpot contribution missing?

noticed lately when playing a few slot sessions that the progressive jackpot seems to barely budge, even after long stretches of steady play. i always check the displayed amount before and after a session out of habit, but even after decent volume, the jackpot meter looks like it’s basically stuck. not just on one game, either - been seeing this across a couple different machines, both new releases and old classics.

starting to wonder if anyone else is tracking this kind of thing or if i’m just losing it. part of me thinks there could be some change in the contribution rate or maybe even a system delay, but i can’t find anything official about adjustments or new policies. curious what everyone else is seeing, especially from folks who log session data.