I'm getting to the mid game I'd say and I kept building more constructors, only to find that for some reason about 6 were sat idle in this case. I only noticed because it bugged me that the same resort spot kept pinging on the map haha.
I manually ordered them to build the bases in the end and switched them back to full auto, I'll see if they go back to sitting idle or not.
Ships were fully fuelled and latest build, with more than enough range to reach the planned bases

Anyone else noticed a similar issue or able to explain at all?
EDIT: I didn't explain very well - the bases are ordered, constructors are in fully automate. I don't have any resource shortage issues or unable to reach the ordered bases due to any fuel / storms / hyperactive range issues.
The issue is constructors are not being assigned to these builds, even though they have nothing better to do at all.