Hello,
This support article will explain your double: https://support.kaspersky.com/kts20/settings/protection/15158#block3
Inbound (packet): the rule is only applied to incoming network packets.
Outbound (packet): the rule is only applied to outgoing network packets.
Inbound/Outbound: the rule is applied both to inbound and outbound network packets or data streams, regardless of which computer initiated the connection.
Inbound. this rule is applied to network connections opened by a remote computer.
Outbound. the rule is applied to network connections opened by your computer.