High voltage LED strips, these are most commonly used in outdoor settings for long runs - out of touch of anyone to prevent potential shock. Great for lighting on hotels/etc accent, can be used on long runs without the DC drop we see on 12-24V DC low voltage systems.
In short, these were not designed to be dimmed but rather to go full power for long runs. The built in rectifier is probably a cheap slap on and you most likely have strobing all the time. Look with the camera on your phone to see if you get the trademark flicker. The only way to try to fix it is wiring on a non-stroboscopic drive power supply. If it’s strobing don’t use it where the lighting is essential, you can get some eye strain even if it is imperceptible.
I’m sure there is a way if you wash out the strobing completely, but I don’t think any of these options would be cheap. Better to get a big 24v driver, size up on wiring using a wire length calculator, and distribute out if you really want to have active dimming.