Hello everyone, I have come to you with a problem that I cannot solve or find a logical explanation as to why it is not working.

I have three routers from different manufacturers TP-Link, Zyxcel, Huawei - on two of them everything works fine, except TP-Link - the same SIM card is inserted in the modem as in the others, all of these devices had the PIN lock removed, so it can't be the SIM card problem.

All settings such as Port triggering are off, UpNp the same is off, no firewall on these devices was turned off, the settings are literally the same and only on the TP-Link does not allow connection, nothing connected to the Cisco MX67 and further to the Cisco MS130-24P is unreachable. When I change to Zyxcel or Huawei everything works without configuration as it should, even after pressing the hard reset button on the router.

used devices: 
ZyXel LTE3202-M430 <- works perfectly fine

TP-Link tl-mr6400 v1.0 <- dosent work at all

HUAWEI B535-232 <- works evrything fine

dhcp is running on all of these routers... subnet is different than on Cisco Meraki MX. 

Any ideas why? there is any problem with firmware at TP-Link?