So, I see that there are various workarounds for this annoying ordering bug, none of them being really very attractive.
Thanks to one poster, l have downloaded PhotoShackPro from the app store, and while the Gui is not as elegant and fluid as the iPad photo app, it can displayfull Exif information, plus, is perfectly possible to order the photos in a completely free user defined way/ custom sort by simply selecting them (one or several at a time) and freely moving them around. Plus you can get them ordered according to the date when captured.
It is a shame that the Apple photoapp cannot do this by default, and I will not mess around with exotic exif manipulation tools in order to fix the shortcomings of the apple software.
But I am glad I came across the advice to try photoshack pro, albeit it is not really cheap. I will stay with it for now, till Apple will fix the ordering mess.
Cheers, Bernie