The autocomplete result list does not always return a complete list of matches. This bug is similar to https://www.drupal.org/node/1430418#comment-5776092 →
You're attempting to limit the number of options to 10, but what is actually happening is that you've limited the number of records returned by the query to 10 -- the first 10.
To demonstrate, create a view on a large dataset with many duplicated values. Add an exposed filter with Autocomplete enabled. The pop-up autocomplete list will contain fewer than the requested number of results, depending on how many unique values appear in the first n rows of the view result.
Closed: outdated
1.0
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
As Drupal 7.x and also modules 7.x versions "ended their lives", closing the 7.x issues.
And thanks for participating and using the module.
p.s. if this still an issue on the latest 2.x version, please feel free to re-open and update the version accordingly.