Why did my ships just do that?

[steelwing]

So I've played through the beginning tutorials and I'm on to the intermediate.  I'm building ships to send to the first planet, and all of a sudden they're flying off to the planet as they're built.  What's causing that?

[Coppermantis]

It sounds like you set the space dock's rally point to that planet. Give it a new rally point (right click) and they'll go there instead.