We check both your pages and it seems that on the first page (http://devconcepting.boudoirduregard.com/le-concept/) row-reverse on mobile works correctly. Please, check screenshots https://gyazo.com/e4b34d948cf6fd361ceffc2241d7a532 https://gyazo.com/493834ca9c8960f5795d790be718304c.
But on the second page (http://devconcepting.boudoirduregard.com/florence-temim/), there are no rows with the row-reverse option enabled. Please enable this option first.
Regards