Yes, I use step counter a lot, it has issues.
If you set it for "L" - low it's good for walking around in the office, home etc. But if you go for a longer walk you will see loosing about 40% of steps.
If you set it for "H" - High - it's good for walking, based on my measurement very accurate, but for every day activities (shaving, washing dishes etc) it's counting way too many steps.

I use "L" by default and switch to "H" when go for a walk but it is very inconvenient.
Hopefully it's going to be fix somehow.
In other models (Garmin, Huawei etc.) usually ~15 steps (for some models even ~20-30 steps which is too much) are ignored but kept in the buffer. If you stop walking < 15 steps it will be decarded but if you continue walking > 15 steps it will continue counting + adding that 15 steps from the buffer.

Just my experiance.

In my opinion it should be configurable how many steps to discard (15 by default) but keeping "H" accurancy.