I've replaced a bunch of light bulbs with LED bulbs (specifically, these: https://www.homedepot.com/p/EcoSmart-75-Watt-Equivalent-BR20-Dimmable-Energy-Star-LED-Light-Bulb-Bright-White-3-Pack-1003020602/303701036) and am now experiencing occasional flickering on some of the dimmer switches. All the wiring in the house was re-done in 2013 during a gut renovation, and I am using the same model dimmable ecosmart LED bulb throughout. Also this is in the US. I've made sure the bulbs are screwed into the socket quite firmly, so I don't think that is the issue.
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 "Dimmer Compatible" 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.