Two different mortar colors it looks like. They may need to go over the lower half with the darker color. I prefer the darker color.

2 different colors of mortar, 2 different types/colors of sand, 2 different mix ratipos, upper portion may not have fully dried (if the bottom portion was applied a few days or weeks prior to the upper portion). Those are my best guesses. The color difference may be what is throwing off the look of the mortar width between the brick--it could just be visual. Have you measured the joints? If they measure differently, then my guess would be a different mason did the bottom than did the top.

Hope this helps!

Thank you both for your replies. I didn't measure but last night it didn't look as bad in person as the picture. I would still like it fixed but also luckily shutters will be on both sides of the window.

Thanks again!