Box design program not working? Advice for Design program for Mark Audios Alpair 7MS drivers?

Not sure if an Alpair 7 had same specs but here’s a box I did a while back. Flat wall mounted MLTL.

Plans:
https://www.diyaudio.com/community/threads/full-range-on-wall-for-home-theater.260758/post-4028642

Built:
https://www.diyaudio.com/community/threads/full-range-on-wall-for-home-theater.260758/post-4472884

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I would add a BSC circuit. Probably 1mH parallel 4.7ohms.