Creating road texture is square shaped at the edge

Unity Engine
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1

I am following a tutorial on creating the terrain.

This is the tutorial: https://www.youtube.com/watch?v=99IecSRWA5Y&list=PLtLToKUhgzwnk4U2eQYridNnObc2gqWo-&index=4

I am at the step to draw a road texture on top of the terrain. In the tutorial, the road texture is all smooth. But on my computer, when I draw the road texture, it’s all squared shape around the road.

Does anyone know why this is happening?

Here is a screenshot:
unity road

2

The guy in the tutorial probably just has a higher-res terrain. Did you use the exact same terrain size and brush size as the person in the tutorial?