Why do photos disappear from my Facebook timeline?

[Sarah]

I posted a nice photo of myself yesterday and tried to make it my profile pic but I didn't like the way it looked in the little icon so I put my other picture back and the whole post from yesterday just disappeared from my timeline and I don't know how to get it back. I don't want to "share" it on my timeline, that just looks conceited. Does this happen to anyone else? I spent a lot of time making this pic look perfect and now I'm sad..

[Shelley]

Exact same thing happened to me tonight. I couldn't be more frustrated. I tried removing the profile photo and that didn't work. The original is still visible in my album but not on my timeline. I tried starring the photo as well and nothing .... So frustrating.