Join Date: Apr 2016
Location: Troy Michigan USA
It looks to me from the wood grain that there was stress relieved in the board when you ripped it. Was the wood acclimated for a while in your shop before you ripped it? Woodnthings jig should help you bring it to straight again.
The width of your plywood may measure the same at different points along the length...But it may have followed a slight radius in the factory edge. Before ripping long joints (whether using a jig or not) the wood should be acclimated to the environment because the center of the board's width is always a bit moister than the edges, and when sawed will cause it to try to reform to it's natural tree like shape.
Another tip, before gluing consider arranging the boards so the grain rises as much as possible in the same direction, which will reduce chip out when surface planning. And plane so the plane blade will skim over the rising grain instead of catch the rising grain (causing chip out).