No Incoming data on One Side of IPSec VPN Tunnel

I have created an IPsec tunnel between two fortigate firewalls. On the first fortigate firewall, there is both incoming data and outgoing data(see attached photo 1.png). On the second fortigate firewall, there is outgoing data, but not incoming data(see attached photo 2.png). The IPSec VPN Tunnel is up on both fortigate firewalls. I have checked the match logs on both fortigate firewalls, but have not found errors. How do I solve the problem?

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