Hi cmor,
The thing your losing sight of here is
you haven't gained any weight that's huge.
If your not gaining weight and your exercising then the weight should start to drop off, nothing ever works the way we want it to or as fast. I lost about 2 inches (cut 2 extra holes into my belt) in about 3 months which is
ridiculously slow.
Especially when you hear that I went from a 48in waist to 34in in a couple of months without any exercise just cutting out sugar.
Like you I expected
miraculous results when I started exercising I expected to lose the next couple of inches in a week, because I was exercising and changed to a keto diet.
I felt very cheated that this did not happen.
But like everything here it's about life choices not quick fixes.
I'm still losing abdominal fat and starting to put on muscle which is the goal. It's taken a couple of weeks longer than expected
BUT I'll be doing this for the rest of my life SO what's a couple of weeks when you think about it.
When you exercise you cause micro damage to the muscles which the body knits back together over night, and muscles weigh more than fat as you said, this does not mean it's not working. You say your feeling slimmer.
My advice is trust your mirror.