Lightbox Down-sizing my images?

Hi there, I’ve been using your plugin for my art portfolio but I seem to be having some sizing issues with the blocks and lightbox.

Regardless of which number I put the quality at, the images in the grid still look fuzzy and pixelated.

No matter what number I use as a size on the lightbox, they are unchanged and not great quality when the lightbox is clicked.

The quality issue seems to go away when I get rid of the lighbox and use a link instead, but the lightbox just works so much better for people to look through my portfolio.

The best example right now is on https://jpawlik.com/personalwork/ under “Exploring Toronto”. The images are 1000px wide, I have set the size to be 1000px wide in the lightbox but they show up small and poor quality compared to the original file.

Lightbox thumb: https://jpawlik.com/wp-content/plugins/photoblocks-grid-gallery/public/timthumb.php?zc=3&w=1000&h=1000&src=https://jpawlik.com/wp-content/uploads/2018/01/ColourDeadCityWallpaperNovember-copy.jpg
Original: https://jpawlik.com/wp-content/uploads/2018/01/ColourDeadCityWallpaperNovember-copy.jpg

Notes:
-I’m up to date on all plugins and wordpress
-I’m using chrome, but have tried other browsers and issue is the same
-Most images I’m using are either 1000px or 650px wide
-SOME of the 650px images look fine, but not all

Am I in the wrong here, did I miss a step? Let me know because I love this plugin-it’s everything I’ve been looking for!

Thank you!

The page I need help with: [log in to see the link]