Double display of dates in d/w/m view.

[Wallflower]

For some reason, my calendar is showing double dates in the corners of the
month (and also 7-day week) views. This never happened before.

If you can picture it, the 35-paned month view has the date in both the
top-right & -left corners of each pane.

Before, each date of the month was only displayed in one of the top corners.
What is going on and how do I fix this?

Very perplexed,
Wallflower