Inconsistant Output Across Apple Devices

Hi There,

I'm using calibre 3.14.0 on Mac OS 10.13.2.

I'm converting a .mobi file I authored to ePub, but the 'last page' output on Apple Devices varies.

• Desktop iBooks - Last page appears as desired
• iPad 3 iBooks - Last page appears as desired
• iPhone 7 Plus iBooks - Last page appears twice
• iPad Pro iBooks - Last page does not appear at all

Any idea what may be going on with the iPhone and iPad Pro versions?

Thanks,
KB.