You know, I thought there was something wonky about those fins (I mean wonkier than they were intended to be) but I couldn’t figure it out until now.
THEY’RE UPSIDE DOWN.
I built ’em wrong and installed ’em the same wrong way. The aft end of the root edge is supposed to be the forward end. Hoist by my own petard!
I could slice them off and turn them over but then I’d have a squared leading edge and a rounded trailing edge.
I could slice them off and remake them but then this silly rocket wouldn’t get done until around the time NASA puts a crew on Mars.
Or I could adjust my OpenRocket file, delete this post, and pretend I meant to do it that way.