Why did my zero change after grinding coffee? There is more resistance when adjusting finer too...

After grinding, there may be a bit of coffee fragments left between the burrs. These coffee fragments can sometimes generate false chirps (occurs much earlier than expected) which get interpreted to be 'zero' by new users.

The zero point shouldn't change unless it's been disassembled and put back in a slightly different state. But if the zero hasn't been adjusted from factory, then the zero point is pretty reliable and won't change until it's been disassembled again. So you can keep adjust finer with full confidence knowing where your zero is and that the zero won't change just from grinding some coarse coffee.

Those fragments can also sometimes prevent the burrs from closing properly and thereby preventing you from adjusting finer (i.e. bringing the two burrs together). If this is the case, all you need to do is to turn on the motor while making finer adjustment.

This is a characteristic of burrs design itself (which can also vary between batches sometimes), but fortunately this behaviour does improve with seasoning in our experience. So it is a normal behaviour that we would expect and is not an issue per se.

Here's a quick drawing to illustrate what we meant: