We are getting slightly different things. It may be because you are on Windows with 8.12, and I'm on Mac OS with 8.02, but I'm can't read tags fluently. The reason I posted about tags was to see if the all-caps from the measurments pallet and Style menu coded differently, which for me, they don't. I also didn't post the whole text file, but I'll post it now.
Can you post another XTags, but have your unstyled text at the beginning of the line, and the applied style after, like in my example? I'm not sure if our tags are supposed to look the same or not, but if we compare oranges to oranges, it might be more clear. Here's another XTags from me. This time, I have three blank paragraph returns at the top of the text box, and a blank return between the two examples. I also named my paragraph style Elvis just so it stands out. You can see the line that starts with @Elvis: is blank (that's the first blank line in the paragraph). The all-caps are applied locally (not with a character style).
<v8.02><e8>
@Normal=<Ps100p100t0Y1h100z12k0b0cKf"Helvetica"n0o("Calt","liga","locl")L0G0>
@Normal=[Sp"","Normal","Normal"]<*L*AL*h"Standard"*s"None"*kn0*kt0*ra0*rb0*d0*p(0,0,0,0,0,0,g(P,S))>
@Elvis=[Sp"","Elvis"]<*L*AL*h"Standard"*s"None"*kn0*kt0*ra0*rb0*d0*p(0,0,0,0,0,0,g(P,S))Ps100p100t0Y1h100z12k0b0cKf"ArnoPro-Regular"n0o("Calt","liga","locl")L0G0>
@Elvis:
¿¡all - caps!? --- <Ko("case","cpsp")>¿¡all - caps!?<$o($)>
¿¡all - caps!? --- <Ko("case","cpsp")>¿¡all - caps!?<$o($)>