We call that selection "samirandom" as it typically does not make logical sense why things happen and why things don't, to the extent that we think that it's a bug. However, when a bug report is filed, it is promptly marked as not a bug and life goes on.
With respect to your linked planes -
1. There's good reason it wasn't ordered. It's a terrible plane.
2. Production ends in 8 months. That's plenty of time to order it, and people probably will for range purposes until the -34 comes along.
3. Production ends in 3 months. Fairly useless variant that doesn't do anything better than other ones. In real life, this variant sold 10 copies to SAS.
4. It's the largest F'ing 27 that you can get. However, the type as a whole is aging at this point and there are better alternatives, so it probably won't sell many copies.