Foundry counts all Riven mods beyond the first as duplicates

[Teridax68]

Not a particularly serious issue, but currently all Riven mods beyond the first are considered duplicates in the Foundry, despite being completely different from each other. For someone like me, who prefers to keep exactly one of each mod I've collected, and therefore stay at 0 duplicates, this gets a little annoying when clearing dupes out.