Adidas is the only brand i really wear (even prior to miami switching) and all there stuff fits weird lol. I wear medium and all my shirts look like they can be small-large. So I wouldnt be shocked if the jerseys fit different.
Never worn adidas but all the Nike stuff I've worn in the past especially jerseys are a tighter fit. Usually have to do the next size up for Titan jerseys. So I wear a XL normally so I usually order a XXL.