No Low E on Midi Bass

Hi there, loving my new purchase, except that i get tracking on my bass down to the bottom E, the f (first fret) triggers the sounds, but my bottom E open is just the dry bass. I’m in standard tuning, going straight into my interface with a clean signal. Using a yamaha rbx a2 bass guitar, line 6 toneport ux2 and this happens in both the standalone and vst plugin version.

What am I doing wrong?

Maybe you are out of tune? It should track the low E1, but no further down.