This is a common issue, especially with older dimmers or incompatible LED bulbs.
Solutions: Try using LED-compatible dimmers or dimming LED bulbs specifically designed for dimming.
It's not very often our dimmers don't work fantastically. We probably have a 95% success rate when we fit our dimmers, which gets the full range of dim that we know, love and share on our videos. Make sure your light fitting / bulbs are in fact dimmable, and we'll do the rest.