Definitely not an odd question. I have an ileostomy and usually, depending on what I've eaten (but not always), even after 12 years, there are often new and unusual odors emitting from the bag area. I always put tape over the filter too, but that doesn't prevent the stench. If it's like an old drain or open sewer (honestly about the only way to describe it), it usually means a leak is in progress or about to happen, but strangely enough, sometimes there is no problem with the bag/base at all.
Have asked family and friends (the truthful tactless ones!) if they can smell anything, and the answer is always no, pretty sure they aren't just being nice (particularly my brother, am sure he would be proud if had produced some of the odors I think I can detect!). I think as ostomates, we do develop an acute sense of smell, and as our bum is now in the front instead of back, perhaps we are oversensitive to any aroma, who knows.
I rarely eat fish or seafood now because the stench is almost instantaneous, unless it's the night before change-day (about every 4-5 days), but NEVER on the same day I've changed the bag because the scent will linger on forever.
Then again, sometimes when I empty, there is a distinct sulfuric rotten egg smell when I haven't had any eggs for ages, but I do often enjoy a bacon and egg McMuffin, so it could be the residual effects of my weekly treat!
Peppermint tea can work for odor (as well as gas).
Below is a chart I posted a while ago about some foods that can cause odor, definitely not hard and fast rules, just a guideline (I disagree about the coffee causing odor, as for me, the output just smells like a latte!)