I take a look at my calendar and the 31 january span 2 days. My week start on monday. I look here in the forum, the week starts on sunday and it looks fine.
It must be your stylesheet Zarzal. You are missing box lines all over the place, not just the last two days of January, but the last three days of December, etc, etc.
Must be the stylesheet that has your calendar format is disarray.
