Killed the arbiter and map changed

When I killed the arbiter of Ash, suddenly the entire map changed, and i lost many towers. Not sure if this is intentional or if i can show it via screenshots but i will try:
This territory is now completely separated from where i started:
https://ibb.co/HLtvv6Sp
https://ibb.co/8D7DPqTq

And here is where i started.. much of my progress disappeared and the map seems cut off north and east:
https://ibb.co/xSFGrfsQ
https://ibb.co/MynsMGWM

Is this intentional?

After game restart, all is back to normal.