It sounds like the whitespaces you’re seeing are output by the OCR engine you selected for the document type in the Sensible app. You can try configuring a different OCR engine (amazon, google, or microsoft) in the app, or take the following approaches:
You can use the whiteSpaceFilter parameter in your method object to account for unpredictable whitespace output. Here are the docs on the method object that include a description for whiteSpaceFilter.
There’s no whiteSpaceFilter for anchors, but you could design a regex statement to account for extra whitespaces. For text anchor matches, we also have a parameter called editDistance to account for poor-quality scans that have poor quality OCR output. This parameter takes an integer value that allows you to set the number of possible edits for a match. Here are the docs on the match object that includes a description of editDistance and a description of regex matching.