ok, heres a strange thing i've encountered when designing a ship:
When upgrading one particular, medium hull design, when I add a warp drive mk V, which is listed as having size 7,
it takes up 8 spaces. However after I hit clear, or just start from scratch, it will take the usual 7 spaces.
It is only when upgrading this particular design; I tried making and upgrading a few other medium hull designs and it didnt happen with those.
i have a saved game with the offending ship if necessary