Box groups are drawn before other properties with the same priority order

[Former user]

public int thisShouldBeDrawnFirst;

[BoxGroup("This gets drawn before the previous property")]
public int thisIsActuallyDrawFirst;

[Tor Esa Vestergaard]

This is not a bug, but how it's currently intended to work - it was implemented like this for simplicity's sake, as it's actually a little bit tricky to make it so groups generally appear at their first declared member. You can use property ordering to customize which order things are supposed to appear in, as per the Ordering subsection in the Design with Attributes section in our manual. It's on our list to make sure that this is added, but for now we're prioritizing finishing other systems and writing our documentation.

[Tor Esa Vestergaard]

This feature, along with the ability to put groups in other groups, will be in the next patch.