The texture pack is at the top of the list so is taking priority.
Render Distance is set to 14 (according to other help forums 8 is the minimum required to see clouds, though people don't seem to understand the difference between the actual clouds and the clouds that are just part of the sky textures, regardless I have set it to 14 just to cover my bases)
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I also have this problem as posted by DenialXx.
Minecraft Version: 1.13.2
Optifine Version: 1.13.2-Optifine_HD_U_E6
Custom Sky in the Quality settings is set to "ON"
The texture pack is at the top of the list so is taking priority.
Render Distance is set to 14 (according to other help forums 8 is the minimum required to see clouds, though people don't seem to understand the difference between the actual clouds and the clouds that are just part of the sky textures, regardless I have set it to 14 just to cover my bases)