Why am I getting a 413 file size exceeds limits error?

I have a file on LFS that is about 5.7GB. I thought the limit was 10GB so I would be good, but I get this error when trying to push:

LFS: Client error: https://gitlab.com/... from HTTP 413

I tried zipping it up and adding an unzip step in by CI script, but got the same error when it was going through the pipeline and it failed.

It seems I am going over the limit somehow, but I thought the limit was 10GB. Am I missing something?