Have you tried putting the bulbs that are in the living room into the bathroom?

How many bulbs are on the living room dimmer, and how many on the bathroom dimmer?

What are the brand and model numbers of the bulbs and dimmers?

I tried the same bulbs. Bathroom has 3 bulbs. Living room has 5 bulbs. It may very well be the living a little noisier.

Alas, this isn't uncommon in cheap dimmers. About the only thing you can do is replace the noisy dimmer. The buzzing usually is the worst at the 50% setting. Of course, the one that's now quiet could start buzzing at any time.

I have those lutron dimmers with touch control. Not exactly cheap. The buzzing sound seems to come from the bulbs. So what type of dimmers are good.