Wiper problem

while building Jason’s 63 valiant, we did the humpectomy on the firewall, using the wiper motor, pivots, switch, and linkage from the donor 1965 valiant.

The problem we’re having is when the wipers are at rest, at the bottom of the windshield, and when you turn the switch for the wipers on, they go DOWN, before they go up and start their arc.

Only when you first turn them on.

It’s a complete mystery. Lol. And we’re just digging into it.

From pictures I’m finding on the internet, we have the linkage hooked up right.

And the motor parks in the same spot every time. And I remember the wipers working in the 65 before I parted it out.

Anyone ever run into this before?

Thanks. Eric