@melvin-fox The diagram is on the original post but I will link it here in case you missed it:
http://www.geocities.ws/podernixie/htpc/vga2euro.gif
Anyway you just don't join the Hsync and Vsync together, you must put a 1k resistor on each line before combining them together.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first