Pocketbook Era: Books in series missing and duplicate metadata

Hi all

I have two issues with the Pocketbook Era and its library:

Issue (I)
I've been trying in vain to have all books of a series correctly displayed in, some are randomly missing.

• In Calibre the series info are of course correctly captured.
• I have fixed the order of the meta tags in the epubs via the "Modify ePub" plugin and then using the option "Remove non:dc metadata elements" and subsequent polishing of the books. (Of course I made sure to remove the ORIGINAL_EPUB version.)
• The epub in question is v2 (not epub3) which should not lead to any incompatibilities.

More detail:

• I had a series of six books correctly tagged in Calibre.
• However, only four would show up in the Era under that series.
• The other two just won't show up as part of the series.
• Looking at their .opf in Calibre they have both the relevant series and series_index meta tags stored and correctly formatted, i.e. <meta name="calibre:series" content="MySeries"/> and <meta name="calibre:series_index" content="1.0"/>

Issue (II)
Displaying the library by authors (not series), I have duplicate authors showing up. I.e. I see my five books of author "John Doe" twice, namely as a first entry as "John Doe (2)" and right next to it "John Doe (3)". I am positive that there are no additional blank spaces after the name--everything tagged correctly in Calibre.
However, if I click on "John Doe (2)" all five books show up.

Anyone have any solutions for those issues? Thx