Far right (+95) is the not to certain what this is segment which is normally rubbish but could be something good. If its consistantly bad signals you can take the risk and notch it out. This costs you a little depth.
Minus 95 could be classed as +96, as in real life, (rather than the meter display), its right next door to +95. So the discrimination numbers do go in a full circle.
Detectors suffer both positive and negative mineralisation depending on whether you have salt or ferrous ground where you are detecting. So you could have bad ground thats not quite balanced out pushing from -95 into +95, or less likely +95 pushing down into -95.
You don't say if its the top of the beach or down in the wet sand but the main beach problem is the detector seeing the salt as a positive metallic target. Its about silver foil level so with pre motion and multi frequency detectors you had to use the discrimination knob as the ground balance and experiment around the position that foil is knocked out.
I've not had the problem with the ring/foil I.D. but then I never use the icons. Could be a fragment of foil or as I've said the salt beach is a foil target to the detector so that could be the problem. Does it give a better or worse signal in the all metal pinpoint mode ?