Problem powering up 2 NodeMCU´s and 8 * 12vRelays

Using Arduino General Electronics
3

I use :

NodeMCU 1.0

Relays (4 channel):

Power step down controller:

https://www.ebay.com/itm/5A-XL4005-75W-USB-Voltmeter-Case-LED-Drive-Lithium-charger-Power-Step-down-Board/323494845076?hash=item4b51cb9a94:m:mD1j0btLg64MSlDdHlC5qQw

5A XL4005 75W USB Voltmeter+Case LED Drive Lithium charger Power Step-down Board

Power supply (12V 3A):