It is not a 3rd party anything. I caught my company logo in the screen grab so maybe that through you off??
I went back in and deleted the title that I gave the element and it defaulted to "Custom Section 3" I do not know why there is a "3" in the default title but....anyway there is also no "Classic Section" element in the classic element section either
I have attached another image that shows the attributes to this element, maybe that will help