I had a similar problem with a book I was reading when my T1 was still on its original firmware.
After looking at the book in Sigil and making no changes I tried the book again and it was fine. I assumed it was just a temporary glitch exasporated by the original flaky firmware.
Haven't seen it resurface since then and with my T1 running the lated firmware, I've not had a single issue with it.
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