Shiny terrain only in orthographic view

I am admittedly new to terrain in Unity, but I can't seem to solve this issue with shiny terrain. The issue only seems to appear in the game view with the game camera set to orthographic, but it doesn't happen in the scene view or if I switch it to perspective. See below:



See the sheen on the edges on the left? This is using the "dirt" texture from the unity terrain tools sample pack. For the layer I added the diffuse, normal, and mask maps. Metallic and smoothness are both set to zero.

Not sure what else to try here. Any suggestions?

 

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@inorganik
Are you using a specular shader?