Unfortunately, a screen replacement is absolutely not a do-it-yourself job. I'm not sure about the experience level of the tech who installed your screen, but if they didn't have significant training and/or experience in replacing MacBook LCDs, it's very likely it was installed improperly.
I'd certainly contact the firm or the individual who installed the screen.
If they're unwilling to help, or if they say your repair warranty has expired, find a
reputable Mac repair company to make the adjustment.
For comparison purposes, our price (parts, labor, and shipping) to replace a MacBook display panel is $299, and our price to replace the video cable (which may be at fault) is $160. It's very possible you could find this same repair at a lower price, but
only trust a reliable Mac repair source, and see if you can even get a 1-year warranty

.
Best wishes!
EDIT: I see you're in the Bay Area. There's got to be a good Mac shop in your area who can match or beat our prices. Check Yelp for reviews, check if their techs are Apple-Certified.