Sometimes i just buy a bunch of barriers in a single go, buy, place, buy, etc;
A few times it is selecting another fabrication when i enter the fabricator and since im doing it rapidly it just buys it
I am not even touching the joystick or touch pad so its not an accidental movement
Input lag maybe?
Most likely related to ping. I noticed that with a ping over 100 buying things from the fab becomes fairly difficult. Might be the movement you have to do to set down the fabrication and turning back to the fab still affects the menu because the game thinks you’re still moving your LS due to the delay.