AIS Target Range

I just connected a Vesper Vision AIS to my E127. The two units are connected via NMEA2000 network. Two things are going on:

The E127 indicates the AIS is in silent mode but the Vesper indicates it is transmitting. I checked the E127 and the option to toggle out of silent mode is grayed out.

I am able to expand range on the Vesper to 48 miles and see targets. On the E127 I can only see target withing a few miles even when I expand the E127 range.

Any advise?

John Rhodes