Base information

• Minecraft version: 1.12.2
• Mod version: 2.3.24
• Minecraft Forge version: 14.23.5.2846
• Mod Pack: (if applicable) FTB Revelation 3.4.0

I'm trying to create a reactor with the vertical setup for the stabilizers, each one is 5 blocks away from the core in the center. However, clicking the stabilizers doesn't do anything. I've tried replacing the core, and all of the stabilizers, with no luck. There are no invisible blocks in the air either.