Hi,
can you please tell us the filename of one of the files from the TV series where the metadata was incorrect so we can try to reproduce this here?

For the Display Titles it is possible to change the display title settings for a folder and also for the entire library, if you change the display titles for just one folder then browse the files through a smart or active playlist then the titles will still use the old style. Please try changing the display titles in the Options dialog on the General page to see if this gets the titles displaying correctly on the device.