You know how on TV, without cable connected, and you see like "snow"? The sound is "white noise". Same goes for the white noise machine (which I absolutely hate!) that supposedly makes conversations quiet and can be used for soothing babies (don't ask!).
That's white noise. If you never heard of it, it's hard to explain, but it happens often for people with tinnitus.
Ah... perhaps, it's the sound settings on your hearing aids?
Anything that's abnormal is usually caused by a lot of things... volume control, ear-mold, ear-mold tube, microphone, T/M switch, etc.
When the ear-mold ages, it shrinks. That causes it to be loose.
When the ear-mold tube ages, it shrinks... hardens... and/or breaks. Sometimes, it gets moist inside and makes things sound clogged or nasal... perhaps funny.
When the battery gets low, the volume control won't work well. Either the volume will die instantly or it will become weaker and sound funny when the battery becomes weaker.
Microphone can get dirty from the oil or dirt in the hair. A hearing aid cleaning kit should have a tiny brush that can be used to brush off dirt anywhere on the hearing aid.
T/M switch is for telephone and microphone use. Sometimes, the switch is accidentally turned to 'T' mode or 'TM' mode. When that happens, we pick up weird sounds that a normal human can't hear. For example... security systems, automobile brakes, cell phones, etc. One time, my old hearing aid was stuck in TM mode. I could still hear like normal, but I could also hear anything that was giving off electrical signals. If a friend of mine was sitting behind me and someone called his phone, I could tell he was receiving a call... even if his cell phone was in silent mode. If I was at a local Blockbuster Video and was leaving the store through the security system, I could hear the long pitched tone as I walked out.