as noted in the pfsense docs:
"Word of caution: You can have both IPSec and OpenVPN enabled/in use at the same time, however, not for the same subnets. Any IPSec tunnel that references a subnet you wish to use in OpenVPN must be disabled, but IPSec andOpenVPN do not conflict."
Your Site-Site is using IPSec so you will want to use IPSec for your remote clients or switch everything over to OpenVPN
Edit: To see/set rules for any OpenVPN Tunnel, you need to add it as an interface, so you not seeing it is not unusual. What is your clients OpenVPN config? (remove public IPs/FQDNs)