To me it seems like modifier keys are linked to this problem.

I was trying to create a 2-key spread sequence and ran into sticky keys aswell.

I'm using a G15 keyboard and mapped my G2 and G3 to "ctrl + num 8" and "ctrl + num 9"
I keymapped these to "." and "," on the clones.(which are linked to the movement again)
When I pressed both keys at the same time my clones just started running and wouldn't stop.

I've been using my mains "." and "," (whitelisted) to spread them out ever since and it works like a charm.

When I used a 1-button spread on the G3 button this issue never came up.