I've had similar problems with saving after drag / drop as individuals in this thread http://drupal.org/node/1011696. A small change in the ajax update callback fixes this for me. Attaching patch...
Closed: outdated
2.0
Miscellaneous
After being applied to the 7.x branch, it should be considered for backport to the 6.x branch. Note: This tag should generally remain even after the backport has been written, approved, and committed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Version 6.x of this module is no longer actively supported. Closing out tickets against that version. If this is still an issue in an actively supported version of this module, feel free to re-open and provide steps to reproduce the issue.