I've been tweaking an existing .epub file and getting some weird bugs when the file is read by my device. Chiefly, that sometimes a large whitespace is added between words, mainly when a word joiner character is nearby. The weird part is that this isn't consistent. At times the whitespace is of normal length, at other times is twice or thrice as large, and other times is five (or so) times as large. I haven't been able to see why this happens and how can I fix it. These bugs only happen in my Kobo device, not in my laptop's epub reader, which means that the file is fine.
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