The cold/hot screen will cover the skill page (from ToughAsNails).
Here is the issue that I submit to ToughAsNails: Glitchfiend/ToughAsNails#583 (comment) (You can check the screenshots)

Mod Version: 1.2.0
Forge: 1.12.2-forge1.12.2-14.23.5.2768
Improvable Skills: 3.5.5r https://minecraft.curseforge.com/projects/improvable-skills/files

Thanks.

Will be fixed in v1.2.1, which should be available soon.