Some do…some don’t. The problem stems from the fact the moonroofs used were not designed for the Avanti…but adapted from another car…Lincoln I’ve been told. So after a period of time with flexing, contracting and expanding the framing or the fiberglass may warp and/or the seals dry out and leaks start. Well maintained…kept garaged…the seals kept clean and lubed…and the problem is minimized or eliminated.