dispensers not functioning properly

I made a machine that makes a jukebox play a random music disc, and before the dispenser was working fine! By the way, this is actually on 1.21.5, but there was no option for it. Anyway, it was attached to an observer clock and suddenly, even though I had used the vanilla tweaks datapack to turn a lodestone into a ‘load’stone, the dispenser suddenly stopped firing. I tried replacing the dispenser, that didn’t work. Then I tried replacing the observers in the observer clock, that didn’t work. Then I tried both in both possible orders. Still didn’t work. The dispensers fire every time I place them down, however. Could this be quasi-connectivity? But then again, it was fine before. Nothing had changed, as far as I am aware.