OCR issue with Color format

Is there a reason why color caused issue with OCR?  Even though the font is readable, OCR have issue with reading it.  If I binarize the image then it works fine; however there are time when image have highlighting over the text which I can read from the image, but binarize will cause issue.  Is there a reason why color shading and the correct font color to make it readable to a human, but OCR cant read it?

Example of original image value that OCR have issue reading

But if I binarize it then it will read it

problem with binarize is if there is highlighting it will be an issue.

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