See https://ru.wikipedia.org/w/index.php?limit=250&title=%D0%A1%D0%BB%D1%83%D0%B6%D0%B5%D0%B1%D0%BD%D0%B0%D1%8F%3A%D0%92%D0%BA%D0%BB%D0%B0%D0%B4&contribs=user&target=MBH&namespace=&tagfilter=&start=2017-02-13&end=2017-02-13
I requested my edits on 13 Feb 2017, but got also Flow edits in 2015.
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(not related to the user interface design, hence removing tag MediaWiki-User-Interface )
It looks like the culprit is the limit parameter in the URL. If you remove it, the query works properly:
https://ru.wikipedia.org/w/index.php?title=%D0%A1%D0%BB%D1%83%D0%B6%D0%B5%D0%B1%D0%BD%D0%B0%D1%8F%3A%D0%92%D0%BA%D0%BB%D0%B0%D0%B4&contribs=user&target=MBH&namespace=&tagfilter=&start=2017-02-13&end=2017-02-13 returns only edits for 13 Feb 2017.
Seems like something is up with the pager also, because if you click on the older link https://ru.wikipedia.org/w/index.php?title=%D0%A1%D0%BB%D1%83%D0%B6%D0%B5%D0%B1%D0%BD%D0%B0%D1%8F:%D0%92%D0%BA%D0%BB%D0%B0%D0%B4&dir=prev&offset=20170213234936&contribs=user&target=MBH&namespace=&tagfilter=&start=2017-02-13&end=2017-02-13, even though start and end are in the query, the page returns all results.
Leaving this unassigned for now but will pick it up again if I have time. Interestingly the limit parameter only causes problems if you go higher than 57, so for example https://ru.wikipedia.org/w/index.php?title=%D0%A1%D0%BB%D1%83%D0%B6%D0%B5%D0%B1%D0%BD%D0%B0%D1%8F:%D0%92%D0%BA%D0%BB%D0%B0%D0%B4&offset=20170214000552&limit=57&contribs=user&target=MBH&namespace=&tagfilter=&start=2017-02-13&end=2017-02-13
An example from first post on this task doesn't work now because Flow was fully disabnled in ruwiki, but I assume the problem still exists in engine.