Mumps? Infections?

Hello again,

I decided to do some more testing today.

I tested IgG Antibodies for cmv, ebv, hsv 1/2, mycopaslma, mumps, vzv.

Before doing the tests I asked my mother if I had anything when I was young like chicken pox , mumps etc. She replied only chicken pox.

Well my results came in today and to my suprise all were negative IgG accept Mumps 15,82 (0-9). VZV was borderline. Any thoughts?