I'm afraid that I'm seeing the same issue. The double <ol> is stopping the Table of Contents from working in Adobe Digital Editions (on Mac, at least). And it worked okay up until the release of CC2014.1. Really hope this can be fixed soon!
I am able to reproduce this issue and looking into it.
Just wondering if you have any news regarding this subject?
This issue is logged at our end but needs to be investigated further. Will let you know if this will be fixed in the next update.
I just wanna wrap this up by noting that this issue seems to be fixed now!