I'm having an issue where only some items get sent, on vulcanus I've got steel and concrete processing and being requested on fulgora but theyre not being sent, however red circuits and batteries from nauvis are being sent, both have valid rockets, some set to allow logistic requests, some not, and both have enough items to fill a rocket

Just re installed and the issue still occurs,

Nauvis and vulcanus can send and recieve to each other but vulcanus can only send its science pack, the red science I have on vulcanus isn't being sent.

Fulgora can revieve from Nauvis but can't send to Nauvis.

Fulgora and Vulcanus cannot send to each other except for the vulcanus science pack on vulcanus

Did you see the following note on the mod portal description?

"[...] the orange ‘on the way’ coloration on requests is delayed until the fulfilling cargo pod has finished ascending from the fulfilling surface."

If you're aware of that, and you still have issues, I'd appreciate a DM on Discord of a save in which the game is in this bad state.

The logistic request icons just stay red, the science packs and items from nauvis go orange but the other planets they just stay red, I also waited plenty of time to allow them to be delivered.

I have a lot of mods installed, mostly planets and their dependencies but I don't see why these would stop the items being sent.

I'll send over a DM your way

Fixed in v1.5.0.