The order of elements in more complex diffs is not consistent with the order of elements in the formal datamodel as specified in https://www.mediawiki.org/wiki/Extension:WikibaseLexeme/Data_Model. This is visible when comparing two revisions with lots of edits in between, or when comparing two revisions from two different Lexemes. The later can be achieved by editing a URL like …?oldid=…&diff=…. This is a typical use case when a user wants to compare possible duplicates.
Screenshot 1: The Lexemes statements are first, followed by "Lemma" and "lexical category". It should be the other way around, statements last.
{F12726360}
Screenshot 2: The Forms statements are first, followed by "representations" and "grammatical feature". It should be the other way around, statements last.
{F12726369}
Also note the inconsistent capitalization of the first characters, which might be worth another ticket.