Removing HVAR rockets does not remove the pylons.

[Rhayvn]

The HVAR rocket pylons create drag and do reduce the maximum speed along with other drag effects.  If you ever arm HVARs, even if you re-arm and remove them, or try a loadout without HVARs after landing from a mission you carried and fired them, you can never remove the pylons again.  This means that after they are on the plane once, the pylons, and drag from them, remain until you get a new client.

Can this be corrected?

[-Rudel-]

I don't know if it can be corrected.   I'll let the programmers know.