It doesn't take much to roll the edge. It's difficult to say without having seen it but I'd wager your first shave the blade was at too steep an angle & too much pressure applied. That would explain the razor burn. Correct stropping is also really important. One mess up, like lifting the spine off the leather, could exacerbate the problem.

On the other hand it could possibly have just been a dull razor, but I wouldn't expect the shaves to get progressively worse so quickly if that were the case.

Gssixgun's post is a good way to find out if it's a rolled edge.