Unable to add content item in content section in position profile as an HR

Summary:

Unable to add content item in content section in position profile as an HR

Content (please ensure you mask any confidential information):

Hello,

I am trying to add a content item as an HR to a content section for skills in position profile. However, I am unable to add the same. When I click on "+" button, it gives me a window like this i.e. without any option for a dropdown. As an admin, I can add though. I have enabled the skill name and minimum skill level fields for this content section under profile types => position. Any help would be appreciated.