I just got two MasterPro 120 Air balance RGB fans and hooked them up to my PC. I have two RGB headers on my Asus ROG Crosshair VI. I purchased a splitter so I could plug both of these fans in to the top header and so they'd be the same color.
When plugged into the motherboard RGB header independently, the fans work fine and sync with the rest of my devices via Asus Aura (tested each one separately).
When used with the splitter, however, they.......do not. They seem to work completely erratically. They'll favor purple a LOT, change color cycling speeds randomly, breathe in and out, and other random things. They still react to me changing settings in the Aura app, but then quickly go off and do their own thing.
Which part of this setup is causing the fans to act this way? Are they incompatible with splitters period? (there is a guide on your site showing that they work). Is my splitter specifically broken?