it is normal a lot of resignation in short times, in grocery store?

If it is a shitty place to work. Lot's of jobs around, so that is additional incentive to look for something better than working for an *******.

If it's constantly that way, not normal.

Ask them why they left, but it's probably shît management. Or somewhere else opened up that pays better.

There's often a large turnover in retail jobs. But 6 in a short period is not typical unless the grocery store is very big and located in a heavily populated metropolitan area. Stores with a great number of employees may experience several resignations and it won't be unusual. But, if the store is smaller and the six people leaving represent a large percentage of the total staff, their action indicates a problem - possibly with the management. It wouldn't be a surprise if poor leadership drove the 6 away at once.