Photoshop CC Hard Round Brush is basically a razor wire fence...

Hey all

I recently got new parts fitted in my PC (an SSD & a GTX1070) and I've encountered a few issues since then, first of all my tablet didn't even work but that's all sorted now, so I booted up photoshop as I wanted to do some doodling and -something- has happened.

Below is my brush strokes now, my hardness alternating throughout each one but you can see that the brush stroke is basically on a grid no matter what zoom I'm on apart from 100%.

Below is how my doodles used to look, there's no patchy bits on curves and it's generally better in my opinion.

The image above was zoomed in by the time I captured the image (being captured before I exchanged parts,) my Tablet is plugged into my CPU as it always had been but somethings happened, any help would be appreciated!