RVS4000 V1 tracks some VLAN to VLAN connections backwards

Firmware         V1.3.3.5
Operation Mode:        Gateway
VLANs:             4, one per LAN subnet
Inter-VLAN Routing:     Enabled
I've got all of the management interfaces of the infrastructure devices
(switches, UPS,WAPs) on the default VLAN 1 that is configured on as untagged on
all relevant ports. I've noticed that the router will track most of the routed
connections from the non-default VLANs to devices on the devices on the default
VLAN backwards, where the destination is listed as the source and vice versa,
often with the SYN_SENT state instead of ESTABLISHED as reported by the source
host.
I get this information from the IP Conntrack view launched from the
Status/Gateway screen. This is how a telnet connection from a computer on the
guest VLAN 3, subnet 10.0.89.0/24 to the default mgmt VLAN 1, subnet
192.168.75.0 looks in IP Conntrack
Basic Information                 Original Direction                             Reply Direction
Protocol     Life Time     State         Source IP     Source Port     Destination IP     Destination Port     Source IP     Source Port    Destination IP     Destination Port
TCP         44         SYN_SENT     192.168.75.98     23         10.0.89.2     50196             10.0.89.2     50196         192.168.75.98     23
Also, there are corresponding entries in the router's access log.
Jan 29 22:26:00 - [Access Log]I TCP Packet - 192.168.75.98:23 --> 10.0.89.2:50196
Notice that it is incoming as expected as opposed to outgoing (to the WAN port).
I know that these are routed connections, for when I turn off Inter-VLAN
Routing, I cannot make any connections from on VLAN subnet to another.
This reversed connection tracking anomaly is causing the firewall ACLs that I have
implemented to block traffic from the guest VLAN (3) to the default
(infrastructure) VLAN to not work, since ACLs are defined based on source IP
and destination IP. Connections to other VLANs other than the default appear as expected
in the access log and the IP Conntrack view.
Is this a known bug with the RVS4000 V1?

Thanks for answer.
I investigated thread you sent and found there the solution, which can be shorten to one line:
Setup -> Advanced Routing -> Inter-VLAN Routing -> Disable
Once more, Many THX
It works and is solved.

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