Anyone know what this is?!

Hello all, I've opened up my Asus Zenbook 15 Pro UX535 because I've had issues with the fans making very loud (fork in a blender) noises. Does anyone know what this is at the top? it's rubbery, I at first thought it was thermal paste of some kind but when I up the case back, it doesn't appear to align with any major components. Does it need to go anywhere? Could this be related to my issue?

Any help would be greatly appreciated ♥️