djmauro:
Anyone know what is going on?
In the beginning of 2018, Arduino started shipping their (original) Nanos with a new boot loader based on the Uno boot loader; that's why the Uno selection works.
You need to update the board manager to version 1.6.21 (see DrAzzy's reply) to get support for the new boot loader. That board manager allows you to choose between 328P which expects the new boot loader on the board (for new original Nanos) or 328P (old boot loader) which works for older original Nanos and clones (clones might possibly never ship with the new boot boot loader).
Information about this in the note on Getting Started with the Arduino Nano