After playing around with my own ePubs, it seems like the T1 will tend to catch italics or bold, but not both. The page you are on will determine which you get (in that a page will always seem to go one way or another, but a particular page doesn't always seem to do what I'd expect). Any pre-rendered pages might be a factor as well.
It's like whatever override they use doesn't actually catch everything correctly, or that it tries to actually auto-generate CSS in a way that doesn't always work right. It's as if they tried to get too fancy and it backfired.
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