in SFP1 out SFP2

Hi!
I have CCR1016-12S-1s+ (tile) v6.39.2 with 2 wan ports sfp1 and sfp2. I noticed that when pinging sfp1 IP from a branch office the packages enter SFP1 and try to leave through SFP2. In result I gen a timeout on the ping.
Has anyone any idea what could be wrong? There have been no recent modifications made and I noticed it a few days ago.

Post an export and a /ip route print, What’s the source IP of branch office PC?

This is something what you have to configure manually:
/ip firewall mangle
add chain=prerouting in-interface=ISP1 connection-mark=no-mark action=mark-connection new-connection-mark=ISP1_conn
add chain=prerouting in-interface=ISP2 connection-mark=no-mark action=mark-connection new-connection-mark=ISP2_conn
add chain=output connection-mark=ISP1_conn action=mark-routing new-routing-mark=to_ISP1
add chain=output connection-mark=ISP2_conn action=mark-routing new-routing-mark=to_ISP2

/ip route
add dst-address=0.0.0.0/0 gateway=GW1 routing-mark=to_ISP1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=GW2 routing-mark=to_ISP2 check-gateway=ping