Hi @vmanera -
It sounds like you've been working with a collection initially created in an earlier version of Funnelback. In v15.10, several new metrics were added to the Content Auditor, requiring a change to an existing collection's filter classes to detect misspellings, reading levels, and the like.
The default values for new collections for
collection.cfg in v15.8 are shown at:
Any filtered document will be subjected to filters in this chain, including DOC(X), PDF, XSL(X). You will need to perform a full collection update for any filter configuration changes to take effect, though.