Ninja Hi!
Please do not think that there is any issue with the date format or the language package.
The Isotope layout set by the MOST RECENT CREATED or PUBLISHED DATE. It should be look like for years: 2017...2016...2015... or for months: December...November...October... or for days: 31...30...29... descending at all! Please check the date order on your printscreen. It is faulty as it is totally random.
The reading direction we use with the Latin/Greek/Cyrillic alphabets in Europe is the common left-to-right. It is a self-evident to let flowing the articles from left-to-right and the rows from up-to-down.
I hope that I could write the issue comprehensible.
Please!