You've lost 25lbs which means your muscles have less fat surrounding them, hence they are more visible
You've got more efficient and stronger in certain exercises
The idea that your weight loss has stalled because of muscle growth is laughable, here's why.
Let's say you're eating at a conservative calorie deficit to lose 1lb a week, for your scale weight not to change would mean that you're gaining 1lb of week of muscle.
Nope that isn't happening, not at a calorie deficit and not on body weight exercises.
If you want too keep losing weight then do 10k steps a day, do a proper weights program and/or do some high intensity cardio (a body weight routine would work if you reduce the rest periods and do 4-5 moves in quick succession)
Eat 10-12 calories per lb of body weight
PS
Thanks for the inspiration for the next verse of Tuco's Lament rofl