While the rom might still be under 16MB/128mbit mark there are still reasons to load it into NOR instead. I can see why people would wantWhy not use the PSRAM for PocketNES instead? NOR is only really necessary for games that are bigger than 16MB anyway.
to have it working correctly.
From my recent experience with an Everdrive GB for the GB/GBC I can tell you that broken/fake/clone carts can have devastating effect to both stability as well as compatibility so my assumption is that OPs card is either faulty or a fake, you should get a replacement.