All images/thumbnails broken after migrating away from WP Engine

I apologize if this question has been asked before, but I’ve been searching the boards for a few hours now and have been unable to find anything helpful.

So basically I was moving a wordpress site from WP Engine to a new host, and there’s been a few issues. I’ve found tutorials online dealing with this, so I’ve gotten rid of the various WP Engine files and that’s worked well.

But the problem is the broken thumbnails/images. Basically on the admin end, everything looks fine, and all the photos are appearing in posts and what not. The file path for images are supposed to be gemhunter.com/wp-content/uploads/year/month/file

But then you go to the site, and the images are all broken, with the file path appearing as gemhunter.com/thumb/w=320&h=320&zc=1/year/month/file.jpg

I don’t know why it’s doing that, and which file to look into. I don’t know what thumbnail plugin I have either, as I’ve looked at my list and the only thumbnail one I see is Regenerate Thumbnails (Someone else set up the site entirely). I did try changing file permissions, but that screwed up the media centre in the admin end, and I could no longer see the photos there anymore, or upload images. As of now I can still upload new images.

If anyone has any idea about what this is and/or how to fix it, I’d really appreciate it. Thank you.