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Whatever is causing it is probably somewhere between the multifunction switch and the brake lamp wires going out to each bulb.
When the turn-signal stalk is in the middle, you should have continuity between both of your brake lamp wires, but the continuity should break when you flip it up or down for a turn. To me it sounds like that continuity might not be getting disconnected when you flip the stalk and is why both lights are trying to flash.
Does hitting the brake affect your blinkers at all too?
Yea so it's definitely something to do with the two brake lamp circuits not separating properly when you turn your blinkers on. That's where I'd begin troubleshooting with a meter, test light, etc. (pull the brake lamp bulbs out so you won't have the bulb filaments connecting the circuits to ground while you try to test them).
×2 on the winch, looks good (kindof how mine is, tucked under the grill a bit)