i'm using HighStock 1.1.3 and i'm experiencing this weird thing: the tooltip shows the wrong x value (the date) while the lower navigator scale shows the right value. However only the navigator is correct, but the value data of the four series inside the tooltip (3.329, 1677, etc.) are the ones of the 11 of february.

It is a bug or it is a weird setting that i'm missing?
Thank you very much
Edit: It happens the same with Highstock v1.0.2.
Moreover, the issue does not happens when the x-axis has hour steps datetime values (e.g. 10 feb 2012 10:00, 10 feb 2012 11:00 etc). It happens when there are fixed day-steps date values (e.g. 10 feb 2012 00:00, 11 feb 2012 00:00)