With two DIFFERENT network interfaces as this
1. ether1 - ip (10.10.0.251/16) - subnet (255.255.0.0) - static IP
2. ether2 - ip (10.10.13.2/16) - subnet (255.255.0.0) - static IP
You have one that is on the network 10.10.x.x (interface1, 10.10.0.251/16 ) and the second that is on network 10.10.x.x (interface 2, 10.10.13.2/16). These are BOTH on the same network..... you are violating the most basic rules in IP and routing!
It's like having Main Street to the left in an intersection AND also Main Street to right... but they are not the same Main Street! How would anyone know which Main Street a specific house number is on?
With bridging you actually connected the two Main Streets together so that they are the same street..
Please read a few primers on basic network design!