I experienced this weird lightmapping bug in my game that causes some models to have glowing artifacts on their surface. These artifacts "move" around, when I edit the UVs of the model in Blender, so I assume that it has something to do with them. I took a few screenshots to hopefully clarify the issue.

 * Engine used: Unity 2019.1.4f1
 * 3D Software: Blender 2.79b

If you need any other screenshots or something, let me know. Thank you in advance!

Lightmap Bug (lights off):

[![Lightmap Bug (lights off)][1]][1]

Lightmap Bug (lights on):

[![Lightmap Bug (lights on)][2]][2]

Models without Lightmaps baked:

[![Models without Lightmaps baked][3]][3]

Unity Lightmapper Settings:

[![Unity Lightmapper Settings][4]][4]

Tree model in Blender with UVs:

[![Tree model in Blender with UVs][5]][5]


  [1]: https://i.sstatic.net/FmSrY.png
  [2]: https://i.sstatic.net/rUvqW.jpg
  [3]: https://i.sstatic.net/ZQp70.png
  [4]: https://i.sstatic.net/SsqN2.png
  [5]: https://i.sstatic.net/q0w6f.png