Bug in editing HTML doc from OO

I created a document in Open Office Writer. I saved it as a an HTML doc. I uploaded it to Zoho writer.
When I made a simple edit to a URL (by right-clicking and choosing "modify" link), the link disappeared. As in, it was deleted.

I checked - it wasn't turned into white text or anything, it just was deleted. Choosing "Undo" didn't do a thing.