Does Apple Books have the same issue with the same books?
Marvin has not been updated for 3 years. There have been some enhancements to text selection in recent versions of iOS that might have thrown it off. But that wouldn’t explain Mapleread’s behavior.
If Books behaves well with those .epub files, then perhaps you could report it to Mapleread developer for a fix. Marvin is probably not going to get any more updates.
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