A solder joint on chip components that is over the height of the part with a convex meniscus is referred to as bulbous or excess fillet. It is caused during separation of the board from the solder wave and is more common in nitrogen soldering.

Possible Causes:

1.Conditions which have caused too much paste to 

be deposited on the pad of the joints with 

excessive solder on them

2.Stencil thickness

3.Squeegee pressure

4.Snap-Off

5.Bleed out

6.Aperture Size/Design

Remedy:Reduce the amount of paste printed on the affected areas