X68000 working on X-RGB 2 plus

Hi every one I have a problem with my X68000 working on X-RGB 2 plus I want to play the 15KHZ games, but i have a x68000 to scart lead, I get a picture through the XRGB 2 plus, but it dont sync on screen the picture just rolls.

Im using a vga monitor via the xrgb-2 plus to try and get the 15khz but the screen just rolls are there any pins i need to connect.

any help would help as im tearing my hair out here

Thanks