Numbers on the source side are sometimes written in letters in the target for better flow or style (e. g. 6 -> six). This gives false positive 'Missing numbers' QA warnings.
Available workaround (if any):
Simple numbers (that may commonly be written in letters) should pass the 'Missing numbers' QA check when their spelled (and sometimes inflected) form is detected in the target segment.
Reducing the number of false positives.
May be loosely related to the preconditions of Introduce locale-specific QA checks.