If you enable the "Suggestions depend on other filter fields" option, then the other exposed filters will be taken into account when returning results for the autocomplete.
However, the Drupal autocomplete functionality will cache results that were previously returned, even if they are no longer valid for the current values of the other exposed filters.
So, for example:
In order for this functionality to work correctly, it needs to clear the autocomplete cache before submitting a request which has different dependent filter values than the last time the request was submitted.
Not all content is available!
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.