A320 Boarding Freight Boxes - Invisible or below the ground level

[bhorv67]

During the boarding process of the A320, normally there's a GSX baggage cart and a separate freight box cart loading. Lately, the freight boxes arrive at the plane either invisible or they're below the ground level.
THe GSX drivers shows up with 3 or 4 empty carts with no boxes, but still pulls up along the freight loader and loads.

What could be causing that and how to fix?

[virtuali]

Please clarify which airplane you are referring to with "the A320"

In any case, from your report it seems you have an airport altitude problem, most likely caused by OrbX, so you might try checking the small airplane icon on the top right of the GSX parking customization page, where it says "Ground Elevation", to fix altitude conflicts caused by conflicting scenery files with different altitudes at that airport.