Redstone Repeaters aren't equipping the player at the same time

I have 4 dispensers, and 4 repeaters are plugged into them.

What I was expecting to happen was:
They would equip me at the exactly same time.

What actually happened was:
I pressed the button and they equipped me at different speed. Repeaters?

Steps to Reproduce
1-Put down an input(lever,button)
2-Plug in 4 repeaters to 4 dispensers(recommended)
3-Activate the input.
4-Note that they output at different speed.

A video goes to demonstrate the bug