Thank you for the report. Posting the server log may help to determine the issue. Please use the pastebin.
Also, please write in exact order, how you wired the components.
I attempted to reproduce the issue using the below steps, but was not able to.
1 - Placed 3 engines and some gas in a generator.
2 - Connected from the generator to a motion sensor.
3 - Connected from the motion sensor to the shotgun turret.
4 - Connected from the generator to a second motion sensor.
5 - Attempted to connect from the second motion sensor to the shotgun turret, but once connected, the wire between the first motion sensor and the turret disconnected.
Please read the pinned post for instructions on how to use the pastebin to upload the text from your output log.