Fighting the curvature of the earth?  

Images with large water bodies have a jagged bump that appears to be the tool fighting with the curvature of the earth...at least that is my theory for the bump.  

Issue - Horizons with the lake as a significant area have a bump that I cannot get rid of when scripting/templating with v2.  


Posted here- https://groups.google.com/g/hugin-ptx/c/oaNMyewMti4