Im having this problem. A strange gray overlay is on the product pages but not all over the page just at top FYI: Im using this theme KalaBabies - Kids Store and Baby Shop Shopify Theme
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Hey @Jmariosp
Eunice here from the Social Care team at Shopify. Thanks for posting!
I’m here to help you find the support you need for your theme.
Shopify Theme Store
If you purchased your theme from the Shopify Theme Store you might find the answer to your question by checking the theme’s documentation for a tutorial, or, by contacting the theme developer directly. Both the documentation and contact details will be located on the theme’s listing.
Third-party theme store
If you purchased your theme from a third-party theme store I recommend contacting the store directly for help with your theme.
Shopify Experts
Experts are trusted, third-party agencies and freelancers who you can hire for help with your theme, and other aspects of your business. Head to their website to view Experts available.
This handy resource provides more information on where to find support for your theme. I hope this helps you find the support you need
Because you’re currently working on your product pages I thought you might like to check out this blog. When designing an online store, a lot of focus goes into the homepage, but to make sales you need awesome product pages. This blog provides inspiration by offering examples of stand-out product pages from real stores.
All the best!
Sorry you are facing this issue, it would be my pleasure to help you.
Welcome to the Shopify community! 
Thanks for your good question.
Please share your site URL,
I will check out the issue and provide you a solution here.