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In my case there are no groups, I try to find reasons why firewall can intercept TCP session and answer with RST and only one I have found is denying rule

Hi mates, we have a strange behavior with tcp sessions as it randomly resets by Opnsense(if I understand correctly from tcpdump).  I have captured WAN and LAN interfaces simultaneously and have found some interesting thing, host A(behind WAN) sends SYN, host B(behind LAN) receives SYN and answers with SYN/ACK and suddenly gets RST from host A. But in actual host A doesn't send RST(there is no such packet in capture on interface WAN and TTL=64), also SYN/ACK from host B doesn't comes on interface WAN. Problem appears randomly and I can't find any dependancies with time of a day and resource and channel utilization, maybe someone can suppose what can cause such behavior?