@capricieux—
It's not a reupload; it's a different scanlation.
The group that has been doing most of the scanlation doesn't complete scanlations in publication order, but uploads scanlations when they are completed. They're not trolling; however, they have the mistaken notion that there is, in effect, no internal chronology to these stores nor otherwise an evolution of the characters, so that there is no reason to prioritize based upon order of publication. (People such as I delay our reading until gaps are filled.)
The previously uploaded scanlation of this chapter is by a group that appears to prioritize by order of publication. If that is so, and if the usual group doesn't change its practices, then they may repeatedly be
scooped by this new group, or by some other group.
The best outcome might be if the two groups joined forces, with the new group continuing to release in publication order, drawing upon what has been accomplished by the older group, and the older group continuing otherwise to work in the order that makes them happy.