Join Date: Apr 2014
Location: Central Michigan
If the style was cut to the correct length then the rail wasn't fully seated. If the slight angle isn't noticed where the panel and rail meet, AND the rest of the door is square, then all you need to do to "fix" this would be to strike a line on the rail from style-to-style ends and use a hand plane to plane the edge even. No hand plane? you could try doing it on your table saw in one three ways 1) using sled, 2) saw with fence capacity to work with size of door, or 3) freehand, which may leave an uneven edge.
Small gaps can be filled. Best way is to use sawdust from your project. The really fine stuff you make by hand sanding, or finding in the bag on your sander. You can mix the sawdust with a little glue and use that, Or... Put a little glue in the joint, and then sand it while the glue is wet. If the gaps are large the filling may show when finished, if that's the case, consider painting your first set of doors.