Suspiciously high number of un-checked options on the LEFT and a more likely scenario on the RIGHT where most options are set to neutral (don't care).
The settings on the left search for text that is NOT any of the un-checked styles, which may miss some of the text you are searching for.
Meaning of the 3 checkbox settings in the SARAs Find options
Meaning of the 3 checkbox settings in the SARAs Change options
If you want to ignore, leave unchanged, attributes, then the checkbox setting to use is the neutral one.