This is what's happening.
You can (barely) see in the top left that the Mouse.AbsoluteX and Mouse.AbsoluteY are precisely equal to the X and Y of the Square following (Aim). It has more definition at Gyphy. They are the last 2 items in the log.
There is no Parallax in any of my layers and every scale is still 1:1.
I'm stumped.
I found out. I'm using a 1600x900 display and the game works under 1920x1080, so there's the difference. When I set the game display to 1600x900 it works perfectly.
My question now is, is this a bug?
May I ask why do you use Mouse.AbsoluteX and not Mouse.X or Mouse.X(layer) ?
Well... Because I didn't know Mouse.X("...") existed actually. Your solution works flawlessly, but then again, shouldn't Mouse.Absolute work too? In case it isn't broken, what would be the point of Mouse.Absolute then?
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Since the vast majority of Construct games are auto-scaled to support different display resolutions, I really don't know why anyone would need the absolute mouse coordinates. I have never used them. Maybe if you are making a desktop project and need to resize/move the window..