Having three and a half lops (Honey has one floppy ear so we refer to her as 'half' :lol
mine do get their ears wet, though I've noticed Cody and Mishka aren't too bad generally. Pinot on the other hand is always getting his ears wet. In warm weather he flops against the bowl and I'm sure dips his ears in on purpose.
Unless it was bitterly cold I wouldn't worry, and certainly not in this weather. If anything it helps keep them cool
In fact in hot weather I often go around all the buns and get their ears damp on purpose. It's a good way to help them cool off. They always look like they appreciate it, though that could just be because I'm making a fuss of them :lol:
Snowflake, whilst not being a lop (generally - she has her moments, the weird little thing! :lol
also dips her paws in her bowl. They go right over the edge and into it. I don't know how she does it! We've seen her do that a lot the past few days.
I know there are special cat bowls to accomodate their whiskers, you might be able to find something similar that would suit your rabbit