Pfsense Issue GRE & Source IP.
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X.X.X.X - WAN
10.201.99.0/24 - LAN
192.168.100.1 - GRE Tunnel IP.
Static Route: 10.80.99.0/24 -> 192.168.100.1
X.X.X.X - WAN
10.80.99.0/24 - LAN
192.168.100.2 - GRE Tunnel IP.
Static Route: 10.201.99.0/24 -> 192.168.100.2
How is your outbound NAT configured? Firewall>NAT, Outbound.