One big part of the problem is the way the dropdown for EPG channel selection is structured. This does not only affect one EPG with multiple entries with the same channel number but also multiple EPG using the same channel numbers. Here is the first EPG
And here the second EPG
In this case, the tag option value is not unique. After selecting ZDF HD, the menu defaults to ShopHQ and there is no way in changing this to ZDF.
The same would apply with identical channel numbers in the same EPG.