Product(WG761) NITRO 80V 21" CORDLESS SELF-PROPELLED LAWN MOWER WITH BRUSHLESS MOTOR & REAR WHEEL DRIVEWhen mulching, there are clippings visible
(WG761) NITRO 80V 21" CORDLESS SELF-PROPELLED LAWN MOWER WITH BRUSHLESS MOTOR & REAR WHEEL DRIVE

When mulching, there are clippings visible

Try this solution

Raise cutting height of wheels to shorten length of the cut

Do not cut off more than 1/3 of total length.

Possible cause:
Too much cut grass.