In the planet castra mod the forge takes over the red and uranium ammo void summon recipes and makes it so you can't make them anymore in normal voidforges...not sure why.

https://i.imgur.com/B3CTVv1.png

This is an issue with the base Voidcraft & Castra, which was reported in this discussion : https://mods.factorio.com/mod/castra/discussion/67c9c4ff6ae0b4a9e813439f

I think this will need to be fixed on Castra's end. There isn't anything I can do to stop another mod from changing this mod's recipes.

The dev said "This definitely isn't intended. I'll look into getting this resolved soon" so hopefully it will get resolved.

thanks~