Unable to reach gateway

Hi everyone, I need some help. I have a Mikrotik RB3011. I have two WAN IPs coming into the Mikrotik before going out to two different Firewalls. The 1st set of WAN to Firewall no issues. The second one however is unable to reach the gateway. so xx.xx.xxx.33 is the gateway. .37, .38, .39… is able to talk to each other but they can’t talk to .33. Everything was working perfectly fine before we did a migration. The person trying to get access to the .33 is based in another location. The rest in the local office has no issues. there is no issues to the WAN IP as well. is there some settings that I am missing?

I just noticed this on my log
may/31 19:27:08 firewall,info dstnat: in:Singtel_Bridge_Internet out:(none), src-m
ac ae:4b:c8:8f:b1:1d, proto TCP (SYN), 66.175.220.5:46564->xx.xx.xxx.33:443, len 4

does it have to do with firewall? Is it being blocked?