I just read your FAQ (without checking a single line of the plugin or using it):
"Why is the widget does not display correctly on my sidebar?
Some themes are designed in a way that placing text in the sidebar looks weird. You might want to contact the designer of the theme or edit the widget manually as found in the documentation that came with the plugin."
In most cases that simply means your definition lack specifity. I know you can't get around every single point, but adding more specifity normally helps with getting less "bug reports" from basic-level users.