Hmm, can you confirm what is the model number of each dimmer this is affecting?
By pulsating, do you mean fluctuating a little bit quickly? Or is it a significant brightening and dimming?
Is it only one light at a time?
Tapping the switch on/off stops the behavior all the time? Often light pulsing with dimmers is caused by bulbs which are not compatible with the dimmer. Did you replace bulbs recently?
Have you tried deleting and relearning the dimmers? Have you run a network rediscovery?