I have now had the same problem that others have mentioned with some of my saved predictions disappearing (being reset to 0-0). I entered and saved my predictions on friday morning for the SL and Championship matches (but was unable to make predictions for the friday games as they had closed early ,as I posted on friday). With the Hull v Bradford game being rearranged I logged in on Saturday afternoon to put in a prediction for that match. At this point all my SL predictions for the week had been reset to 0-0. I re-entered my predictions for the sunday games and made one for the Hull game and then saved them. I was unable to re-enter my predictions for the saturday games (I had previously correctly picked a Catalan win v Salford) as they had closed by then.
When checking my score for the week today I found that those two games were still registered as 0-0 whilst the ones I was able to re-enter were still as I entered them. My Championship predictions were not affected.
As I opened up the SL prediction page but did not open up the Championship prediction page over the course of the weekend and lost predicted scores from only the SL page I think that the bug that causes scores to be deleted may be connected to members opening up that particular page of predictions whilst the round is in progress.