Thank you very much. That was indeed the problem. (After playing around with the options, the non-minifigure part 3794a is also showing up correctly, so it was the minifure option and someother option aswell)
I recently build MOC-0845, upon building some minor parts were missing. The missing parts are are listed in the Overview inventory page, but they appear to be missing when I went to "Build this MOC" Page, where I extracted the part List for Bricklink and they are also absent from the exported part list.
The missing Items were:
90370pr0001 Black 42446 Black 4599a Black 30377 Light Bluish Gray
The same thing happens with other MOCS from the same designer. For example:
MOC-1236: 4599a, 30377, 60849 and
MOC-5711: 3794a, 2488, 42446 are missing when proceding to the "Build this MOC"-Page
Or is it just me?