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I messed around with wf-sections for quite a few months, however had to give it up and move on to something a little more simple to work with.
There are quite a few issues with the last release, which is still considered beta, and although Im willing to work with bugs, the inconsistent manner in which they appeared made me give it up. The issue you are describing has happened to be before, and when I seem to remember after I uninstalled and reinstalled the module, it worked correctly, and then broke again.
Im sure your aware the wf-sections team has pretty much discontinued the development cycles around the last release, and I think they are changing the language the module will be written in. You can get more information at wf-projects . com.