on the screen of my v3 the vdi reads +80s but there will be red reject bars on the far left of the scale. Is this wrap around? If not what is it? Also another thing I noticed is sometimes I will get vdi's in the 70's or 80's and good green bars with just a thin red line on them. When I dig it is usually trash. Does anybody else have this? One more thing is it normal for the v3 to say tracking when Im hunting?