Please check the IP address assigned to your WAN interface after connecting it to Starlink. Then, ensure that your LAN is on a different network than your WAN interface. For example, if your WAN is on the 192.168.1.0/24 network, and your LAN is also on the 192.168.1.0/24 network, then change the LAN network to something else, like 192.168.10.0/24. To do so, edit your LAN interface and change the IPv4 address to 192.168.10.1 (scroll down and change the DHCP IP start and end settings to 192.168.10.100 and 192.168.10.249 too).
If you want Starlink to be your primary connection, make sure the WAN interface is at the top of the list in Network -> Interfaces -> General.
If you are using failover, move your WAN interface to the top in Network -> Failover as well. In your case, the order from top to bottom should be WAN -> mob1s1a1 -> mob1s2a1.
In case you still cannot access the internet via Starlink, please replicate the issue and generate a troubleshoot file. To do this, connect to Starlink, wait a few minutes, and try accessing the internet. Next, download a troubleshoot file from System -> Administration -> Troubleshoot and attach it by editing your question. The attached files are only visible to Teltonika moderators.