Don't worry, I know exactly why this is happening, but my only problem is the mesh that won't show up in the map I'm working on while I test run in-game to check for lag and that everything works how it should is a mesh that is included in one of the "vanilla" files; aka, the object group that came with the FH 1.15 update. It's not showing up in-game because it wasn't ever exported through Object Maker, even though I can see it just fine in Map Maker, so my question is is it safe to export that mesh into the same object group? I've had troubles with vanilla files before and have seen issues pop up on the forums about other floofs' vanilla files giving them troubles and were told not to mess with them so, I'm not too sure I should mess with mine.
If I shouldn't export the mesh into it's original object group, then that's fine, I'll export it into one of my own object groups and just change the object's directory in the map's objects.cfg so I won't have to manually remove and replace it (I do this for making seasonal maps anyways).
Thanks floofs!