The function number: N/A
The complete error text: N/A
The window affected: Create Project, missile design, turrets design
What you were doing at the time: NA
Conventional or TN start: NA
Random or Real Stars: NA
Is your decimal separator a comma: No
Is the bug is easy to reproduce, intermittent or a one-off: easy
If this is a long campaign: ~NA
There is no instant button when you still have starting RP point if you are not in SM mode. Also using that instant button does not remove the corresponding number of RP points.
As this button is present in the research tab when you have RP points remaining, the same should be true for these three windows as well