Dual Acces PPPOE Multi WAN Question

Dear Forum Members

I have 3 PPPOE Dual Access WAN connections from an ISP. Each WAN interface has dhcp client enabled and it gets an ip 10.1.90.xx from the DHCP server with some routes.
These routes are for Media sharing and FTP access portals. Each WAN interface has a separate PPPoE client connection configured. The setup is Multi-WAN PCC based.
The PCC Multi-WAN setup is working like a charm. The problem is that when only single wan with pppoe connection is enabled. The clients behind this router can all access the portals
and can ping the ISP Gateway. But as soon as other connections are enabled. The portal access is lost and the clients cannot ping the ISP gateway either.
Kindly Help.

Regards