Are the bulbs LED? That usually causes issues when the dimmers haven't been changed to handle the lower load.
Are the bulbs LED?
I was sure they weren't, but in fact they are... will try to find some non-LED ones and see how I fare with those - thanks!
That'll almost certainly be it.
Swap out for some dimmable filament bulbs and you'll be fine.
@hvsds started
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Are the bulbs LED? That usually causes issues when the dimmers haven't been changed to handle the lower load.