itch.io

They ask you to limit your submission to 3 products in the first post of this thread.

Oh shoot, you're right. It's not there, I'm sorry too. I'd suggest to google around for your issue, or to look at the discussions page for it in Steam or GOG to see if people have had a similar issue.

This is not the right place to ask about that. The game has a dedicated page on itch.io and there is a comment section there where you can ask for support. Discussion in this thread is only about the technicalities of the bundle itself and submissions of games to be added.

They are unable to add separate purchase tiers from items to the bundle. Your project, for example has a free tier and a pro tier and the policy on free products has changed, meaning they won't add them to the bundle anymore. You have a number of options: if you can have peace with the product being in the free collection they are making on the side, you can keep it like this; if you want your product to be eligible to be added, you should temporarily remove the free tier; or you can demonstrate your goodwill without being in the bundle by making the pro tier free for the duration of the bundle.