So I just started a playthrough with a bunch of the fixpack stuff or whatever and I just came out of the mortuary and the entire map of the first section of the hive is "filled in"- the SE section is not, the mortuary wasn't

is this normal?

I left the SE section, came back to it, and then it was filled fully in (and I hadn't gone around in it at all)

and now the next section is fully filled in too

I don't think it's supposed to be like this at all from my memory, and it's a bit annoying that I'm not "discovering/uncovering" the things

If by "filled in" you mean that the fog of war is missing, this is a side effect of installing Qwinn's Tweaks Pack for Planescape Torment. From the readme: If you don't want that behavior, then rerun the installer for the Tweaks and disable it. You don't need to reinstall the game or any other mods.

If this isn't what you mean by "filled in", then you need to provide a better description of the problems you are experiencing.

Yes, but I was sure I didn't install that. However, I will reinstall as suggested and hope that fixes it for my current save. Thanks