I've experienced something like this a couple of times. I found out that it was just a mistyped attribute or value in the css: it seems that while Sigil ignores just this mistake, ADE ignores the whole css stylesheet. It can be something as trivial as a missing ";" or ":" or also a mistyping like "font-sze" instead of "font-size".
I suggest you to re-read very carefully your css; in my case it took me several attempts before I found the mistake (sometimes our brains work in 'auto-correct' mode)
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