I'm using the Date facet as part of a faceted search of approx. 250 nodes. Each node includes a date field, and the data facet is incorrectly displaying the count values. For example, if I have 21 nodes with the value 2009, the display tells me that I have 23 nodes that match the criteria, and yet the results page list only 21 results.
I'm also seeing result counts given for dates for which there are no matches. For example faceted search reports 1 entry for 1991, but in reality there are none.

Although it looks like development and maintenance of this module has all but stopped, I'm hoping that another user may have come across this problem, and solved it. If so, I would be really grateful for any pointers as to how to fix this issue.