This is actually not a bug. What you are seeing is a deliberate effect that's both listed in the scripts Features list, and mentioned in the "How to Use" instructions.
Features
- Show fog between the parallax background and the map
- Show fog above the map
- Set different fog layers to scroll in different directions and at different speeds
Using Fog
The following commands are all made via Call Script event commands.
show_fog(id, "filename", hue, opacity, blend_type, zoom, speed_x, speed_y, z)will add the fog to the map. id is an array index (like picture numbers), and is used to further control fog with other commands.
Only id and filename are mandatory.
z, if used, should be greater than -100 and less than 0 to display fog between the parallax background and the map. If not used, fog will be shown above characters; fogs with a higher id will be shown above those with a lower id.
This means you either didn't use z, or you put it somewhere between 0 and whatever z-index tiles with a star passage setting have (I think it's 100 but I don't have Ace in front of me). Maybe I should add a note to the post to indicate what z values different things on the map have (though I'm not sure I could access the z value of the map tiles themselves due to map formation logic not being available to us)
So yes, setting the Z to 200 will make it display above everything else, but there are reasons why you might want to set it to lower values.
Also, instead of screenshoting the entire desktop, you can Alt+PrintScreen to get JUST the active window. Gives you a smaller file, faster upload, less disk space used (important if you're actually attaching the image to your post), and lets viewers focus on just the problem and not everything else you have visible on your screen
:)