BUGS: Underline applied as Bottom Border / Second highlight applied behind first

Was trying to find a workaround for Multiple highlights on a word, phrase, or passage(s).

BUG 1) Selected both Underline and Bottom Border:

Result: both are applied in the Bottom Border position:

(As a result of this bug, all my older Underlines are now Bottom Borders instead.)

BUG 2) Created triple orange, double light green and single purple Bottom Border styles, and applied them in that order to the same selection. Result as expected:

But:

Created triple yellow, double red and single blue Underline styles, and applied them in that order to the same selection. Result: not only do they show up in the wrong position (bug 1), but the double red refuses to show up on top of the yellow:

The logic of this bug seems mysterious to say the least:

• Edited the double red Underline to a double brown Underline: still hidden.
• Edited the double red Underline to a double red Bottom Border: still hidden.
• Edited the double red Underline to a double blue Bottom Border: showed up as it should, but now the single purple Bottom Border wouldn't show instead (but a black one would). 

(Let me guess: everyone thinking of recreating this now wishes we could share Highlighting palettes.)

And please don't forget the much older Highlighting bugs in DESIGN ERROR: Uneven application of highlighting and Bugs: Logos 4.5b Beta 7 Highlighting: Font Style Choices plus Bordering Lines.

EDIT: I updated the first of these older threads, but I can't update the beta one, which would normally be the one most likely to be first seen by Logos, because that forum is now locked.