That is interesting.

Are they all from the same site (in which case linking might be eating their server space and they automatically reduced pic size)...or from your computer (having been downloaded in the larger size?) If you are uploading them from the computer, did you "resize" them accidentally? OR are you saying the pictures already uploaded or linked WERE larger and now are smaller (as I first thought you said)?

Did the program you're using recently update and perhaps change the size?

I'm thinking...