I feel like this is a hardware issue, perhaps GPU memory issue, but more likely something to do with the Thunderbolt bus bandwidth as it always happens to the bus that has 2 monitors attached to it and never to the one that has only a single monitor attached to.
By repeatedly disconnecting/reconnecting the mDP cables I can get EITHER of them to work, but often not BOTH simultaneously, which is pretty annoying.
MACBOOK PRO DOCKING STATION 3 MONITORS 1080P
The cause for this likely a software/compatibility issue on macOS and I have had this on a two monitor setup as well. The dock offers you dual 4k display functionality by offering dual 4K 60Hz support on Thunderbolt 3 laptops while providing either 1080p or single 4K 30Hz setup dual monitor options for USB C (10Gbps) host devices. The orientation (90 degree rotation setting) tends to get messed up in two of the three monitors and I have to waste 1-2 minutes fixing it on System Preferences > Displays.
I've had this setup for about 6 months now and while it is usable, I do face some issues from time to time, always after waking up the monitors after sleeping overnight: The monitors are arranged in a "H-shape" with two monitors flipped 90 degrees. Two monitors are connected to the right side ports/bus and the third one (plus a dock for charging/USB/etc) are connected to left side ports/bus. I currently use 3 4k displays (Dell P2715Q) on a MacBook Pro 15" 2017 (GPU: Radeon Pro 560 4096 MB).
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