CX-Programmer: Chaining function blocks

I wrote a user defined function block, and I am trying to chain them together. However after the first run they start flickering on and off. I can't figure out why.

Am I missing something about how Function blocks work?

pdfs of my programmer are attached.

Timers is the program.

Pulse_3x is the FB

https://www.fa.omron.com.cn/data_pdf/mnu/r144-e1-04_cx-programmer.pdf?id=1605

This function block / structured text guide will explain how the function blocks work.

Hope this helps you out.
Regards,