After replacing incandescent bulbs with LED bulbs, why am I getting flickering from some of them, but not all, on dimmer switches
TL;DR Your Dimmers are Not Compatible with the Bulbs
Older dimmers don't work with most LED lights. Period. Many newer dimmers work together with newer &quot;Dimmer Compatible&quot; bulbs (as yours are listed). There are even some dimmers available today that are not LED-compatible, and 2013 or older dimmers are very likely to be not LED-compatible.
That being said, there are times when some combinations of LED-compatible Dimmer and Dimmer-compatible LED aren't quite compatible enough. But my hunch is that a new, good quality, LED-compatible dimmer will solve the problem.
Feel free to post the model # of one of the existing dimmers, as that may confirm the problem.