Please see image:
NOTE this was happening with 1.3k. Router is now on 1.3l
One thing I don’t understand is the VLAN column show 1, 2,4 which map to the real VLANS in use 1,15,20.
Could it be an issue if you set a DHCP assigned device IP to one in reservered static Pool?
VALN 15 10.10.15.1/27
Static reservered = 10
DHCP Pool = 19
Example 10.10.15.26 was assigned by DHCP , set the Static as VLAN 15 with IP of 10.10.15.3 - this casued the Ports to set thier Native to VLAN 15.
Ports Config : ALL TRUNK with VLAN 15, 20 passed as TAGGED