Article history is broken (Privátní)

Jak vyvolat chybu: Open oldest history: https://www.itnetwork.cz/…-29-13-34-24 and then the newest history: https://www.itnetwork.cz/…-05-15-01-01

Chybné chování: In the oldest history is added text from the newest history, from the article above, it's e.g. this text:

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[* php/kompletni_kurzy_programovani_php.jpg .(Kompletní kurzy programování v PHP) *]

The text above wasn't in the article in 2016 for sure. Total count of changed chars is fine I suppose, but the diff is just bad

Předpokládané chování: The diff should be made from the previous history, not from the entire history... right?

Důvod/vzkaz

I don't know what cause the problem actually, but I think it worked fine time ago.