Embedding issue

Right now it’s currently embedded because our other admin has been helping us embed our calendar and form. But for some reason, when two of our administrator accounts try to embed the iFrame codes, the items just disappear and don’t embed even though they display on the Visual tab. But once Preview or Publish is clicked, the items are gone from the published page. However, our other web admin can embed those same iFrame codes without problems. So, we’ve been sending him the same embed codes and he successfully publishes them without problems.

Also, when I try to go to the page and make edits, it just keeps dropping whatever was successfully embedded before so I either have to contact our web admin again to embed a couple of items, and I can’t edit the page with the embedded items, and would have to contact him when our department should be able to do embedding.

[video src="https://www.dropbox.com/s/3z4ukrdkk5ggont/WordPress%20embed%20problem.webm" /]

Hoping somebody can share some ideas.