Product(WG720) 12 AMP ELECTRIC 20" LAWN MOWER (DISCONTINUED)When mulching, there are clippings visible
(WG720) 12 AMP ELECTRIC 20" LAWN MOWER (DISCONTINUED)

When mulching, there are clippings visible

Try this solution

Raise cutting height to shorten length of the cut

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

Possible cause:
Too much grass to cut.