Trip report pictures suddenly disappeared

[Kippa-Dee-Do-Dah]

Can anyone help me? I was reading the trip report I'm working on (in my signature), and some of my photos aren't showing up. No idea why. When I right-click to open them in a new tab, I get "URL signature expired". The photos were sized correctly and uploaded just fine originally. I did not upload them from Photobucket or any other website, but instead from my computer. There were some I right-clicked and copied from my FB album, but again, they uploaded just fine originally. I'd appreciate any help!!