Hi,
It seems that u have asymmetric routing here traffic exit from ISP2 and return back from ISP1. we already sure that traffic comes from ISP1 as you mentioned so we have to check outgoing traffic from which link.
Could you try show route table <routing-instance-name> <website-IP-address> and see it is reachable via ISP1 or ISP2
Regards,
Mohamed Elhariry
JNCIE-M/T # 1059, CCNP & CCIP
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