Issue with mood tracker.

I haven't got the foggiest idea what I did or how it's happened...

The first time I took this test (3 days ago now) everything was fine.
I took it yesterday as well, no problem.
Today, I just took it now... and there IS an issue.

The "x axis" (horizontal) line description for THREE days ago reads... "31st December".

Which is clearly not when I took the test for the first time