Tufail,
It doesn’t seem logical at all !
So there is no explanation for it, except maybe to assume that, with RXLEV ACCESS MIN = -96dBm, you’re forbidding calls with rxlev < -96dBm and with a GOOD quality, while still allowing calls with -90dBm but POOR quality... perhaps 🙂 That might just be the case for some cells, but not all of them.