Is it just me or there is only one type of description even though you get to enter short and long description when uploading mod to steam workshop from CK? Short one has a character limit and I asumed it to be used in tooltips when browsing mods while long description is displayed in your mod details. I entered both when uploading but only short description got published and placed in both tooltip and mod description. I then edited long description directly on workshop site but it also put it in the tooltip. Why give us option to enter two descriptions when only short one is going to be used?

That text doesn't currently get uploaded to or saved by the Workshop. For now at least, fill in the long description field after uploading via the "Edit title & description" link on your mod's page.