Are you viewing the rules sorted by priority? Choose View > Sort By > Precedence, or click the header of the “Rule” column in the rule list.
The strange behavior you're getting might be from a high-priority All Process rule, particularly if the traffic is a mixture of TCP and UDP, or of requested and unrequested data.
The strange behavior you're getting might be from a high-priority All Process rule, particularly if the traffic is a mixture of TCP and UDP, or of requested and unrequested data.