1) Confirm that your application ID is the same in your config and your front end (check your queries request on the front end and look for the app id of your crawler).
2) Check wither there are filters or facetFilters that are included in your queries request that are not attributesForFaceting or are not filters that exist in your index.
These are the two main causes of items not being visible in your DocSearch front end.
The free DocSearch plan, doesn't include technical web support from the Support team.