Excuse me Cerino, my memory - and my scoring history - do not comply with "the entire time".
I have been playing intensively last year, 400+ weeklies, and I tracked all my scores. I remember to have played many early monday rounds to compete in the previous weekly (midnight PST is 9 am here), and still there is not a single glitch visible - last day played is Sunday to 100%. The most intense Sunday, March 18, included 13 weekly rounds. I remember why I have been chasing scores the whole day - certainly I must have played some on Monday.
In 2013, I've not been playing enough to prove anything. The first date glitch came only when I looked into it, 11-30.
Alas, when checking your histories, I came across some former proof for the glitch. I found these occurrences in your earliest possible entries, limited by number of entries:
Cerino:
08.05.13 Wk 32 Closest-to-the-hole Challenge Legend 188.65
08.05.13 Wk 31 9-hole Unlimited Play Front 9 Legend 33
Impossible to play two different weeks on one day unless time zones help...
Juggs:
09.01.13 August Bali Hai Sweeps Master 278.9
09.01.13 August Cabo del Sol Sweeps Master 110.71
09.01.13 August Cabo del Sol Sweeps Master 121.1
09.01.13 August Best of Putting Sweeps Master 86.5
09.01.13 August Oakmont's 9-hole Unlimited Tournament Front 9 Master 34
August sweeps played in Sepember?
Thus, I dare say that the discrepancy wasn't there in Summer 2012 but it was there start August 2013.
Do you have any proof in your records?
Edit, to be more precise:
I'm asking for further proof of earlier date in scores stored privatly, be
it Monthlies played on the next 1st, or Weeklies played on Monday. (I
changed the Excel date format to ttt tt.mm.jjjj (in English versions, probably ddd dd.mm.yyyy) and checked the relative position of Monday entries).