Inaccurate steps

My Apple Watch steps seem to be really inaccurate... I got 500 steps for brushing my hair then yesterday I was sitting talking and the clock turned midnight, about 15 minutes later I’d done 120 steps but hadn’t left my seat.

I’ve checked my settings as advised by apple and done loads of 20 min walks outside as apparently that makes it more accurate but still I’m getting steps for nothing!

so frustrating when you have a step goal and you have no idea what’s true and what isn’t!

does anyone else have this issue? Not sure if my watch is broken or they’re just crazy inaccurate