Why am I getting holes when setting selecting an area in FT3 and setting the global temperature

I am using FT3 to start my next world. right now I am setting the temperature. I select an area, starting at the equator and use the global set tool to set teh temperature. I then go out from there incrementally lowering the temperature. I've done this before and havn't had any problems. This time however south the equator I am getting holes which have much lower temperatures then there should be.

Why is this happening?
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