Witkh13 please note that i'm just a user and all that i'm writing are observations and deductions.
The manager decides based on your pc components for which projects it will primarily do work [You can see this in your Science United home page, then "Your Computers", click on your computer name and then "How projects are chosen for this computer". The last sentence says "We then choose the highest-scoring projects (at least 2) that together can use all the computer's processors."].
Then the scheduler, and according with your computing preferences, will add those projects in your "Projects" list and it will make the requests to the respective organizations or universities and wait for responses from their servers. But that doesn't mean it will receive responses, for whatever reason.
The resource share percentage you see it's only a division between 100 and the number of the projects the scheduler has and it has nothing to do with the projects that are running simultaneously.
I have 6 projects (16.67%) in the scheduler but 4 are in active tasks using 100% of the pores i allocated.

Faptimus420 which version of windows do you have ?
If you have time and you haven't done it already, please uninstall BOINC, install all drivers corresponding to the version of the windows you have from your pc's components manufacturers (chipset, lan, gpu etc etc) and then reinstall BOINC and try to connect.

Ok, i'll try to reproduce your problem if not later today then tomorrow and i'll write back.

All working as intended for me.

I am getting "Invalid or missing account key" for project: Citizen Science Grid

I am able to run World Community Grid ... and Rosetta@home (although not getting work, yet)

Any hints?