[Plugin: Media Library Categories] The "number of files" in category is wrong

Hello,
This is wonderful, nearly perfect plugin. There is just one very annoying bug. Strangely, i did not read anyone complaining about it.

1. create some categories.
2. assign 3 pdf files that were already uploaded before to one category.
3. In the Manage Media Categories screen it shows “Sort Media Items (1)”, like there is only one file.
4. When i open that category to sort files, i see only two files and one empty slot (like there should be a file, but there is no address on the line”

To make it clearer, i made couple of printscreens:
https://www.flab.lu/wp-content/uploads/2012-02/Image1.png
https://www.flab.lu/wp-content/uploads/2012-02/Image2.png

This is very weird. Otherwise, this is the only plugin that is close enough to my needs ??