I periodicaly upgrade my constructors with more/faster engines. Version 2 of the constructor had a 4 speed. Version 3 had a 9 speed. Next version had a 19 speed. I upgraded all of my my version 2 and version 3s to version 4. When upgrading finished I sent my constructors off to quick build a starbase. That's when I noticed that they were only moving 4 spaces. I check them all and see that they now have 4/4 or 5/5 for movement. I then produce version 4 on some planets and see that after I launch them that they have movement of 19/4 and sometime 19/5. After the initial 19 is used these constructors now move at 4/4 or 5/5 like the upgraded ones did.
Any one see this before?