I tried both the Encoder and the Export built in, same result in both. So regarding the quality you mentioned, this film is supposed to run in festivals and things like that, so I really need the best quality possible. In those settings (100mpbs) I was ending with a 10GB file (14 minutes video) which is pretty small if you ask me. I think I tried this ProRes 4444 but just 2min of footage had already made 90GB. I could make room for like 1TB but would I even be able to upload a file so huge? Isn't there a middle ground between ProRes 4444 and the settings I'm currently using? Which is the best possible settings to go since it appears I'm tied to 50 mpbs?
Also, I had started this project on the 2017 version of Premiere and then imported to the 2022 version. If that caused the glitch the only solution would be to start from scratch, right?
Ok lots to talk about here;
First, Yes, you can get smaller ProRES and still looks fantastic, 422 for example, much smaller, and great.
However, can the place showing this video play this file? It seems to me if your plan was to use H264, they probably can't. I think you will find after exporting a ProRes file, even the computer you made it on (if windows) will not be able to decode it to play it, but it will load perfectly in Premier for example (Licenses issues etc). I sense that you need to upload this project to the festival, they normally publish a list of acceptable formats. If you can find that list, and see if H265(HEVC) is listed, then the 50 to 60 MPS would be an excellent bit rate, but you need to confirm these details.
My advice is to use H265 (HVEC) at 60 MPS if that works, as it will exceed the quality of the 100mbps H264 file you started this post with. However, you need to make sure the player your going to use can read and play back that file smoothly. H264 is safer, but even then, a too high of a bit rate and the payer will play it back choppy.
You have some home work to do in terms of how you plan to deliver (play) this, and plan around that.
Knowing the history of that project starting in 2017 version, maybe that process introduced a glitch. But when you say imported, I sense your saying you opened the project and it converted it to a 2022 - which often works fine, but you may want to try a new blank project and then import the final edit project into that. I could not find a newer video to explain this; but this should still be accurate:
Why importing a project is key in Adobe Premiere Pro - YouTube
I'm hoping some others have some ideas for you also, as you have tried all the basics liek clearing media cache etc, the import process noted above may rescue you from the very odd max 50mps export. Failing that, a 50mps H264 file is nor horrible, its better quality than YouTube 4k does. If you can get a H265 file at 50 and above, that will exceed the quality goal at the start of your posts of 100mbps in h264.