I have over 100 submissions from the games I'm moderating but it's only showing me submissions from 1 game and its not even showing half of them. Is there a limit on how many can be shown at a time?

I can't verify runs from other games because of how clogged up a particular game is with submissions. Is this a bug on my end or is that actually how it works?

SRC only list max 50 runs normally. If you want to see more there are discord bots which can show a full pending list of games.

https://discord.com/oauth2/authorize?client_id=644879546650198016&scope=bot

As a follow-up to this, the site announced not too long ago that they were working on a package of improvements for mod tools, which included allowing mods to browse more than 50 pending runs. We don't exactly know when these updates will be rolled out, but at least they seem to be in the works.

You can read up on it here: https://www.speedrun.com/news/676-2021-4-14