I concur that in Xiphos 3.1.5-win32, all the red letters look fine.
That's with a stock libsword as of when 3.1.5 was released (though
current SVN then, as built by Greg). But on my usual Linux systems, the
breakage is seen. (FYI, also Matt 25:1,14,31.) There, sword is -r2715.
I happen to have an old -r2679 tree lying around. So I rebuilt that,
installed it...and now my Linux Xiphos doesn't show the problem.
Somewhere between 2679 and 2715, this was broken in Sword.