Suddenly the smallest brush size is too big
Hi, I have a super weird problem.
I opened up a file to continue work on it today, and suddenly found that the even the smallest brush size is fatter than all previously drawn lines. I attached a picture to illustrate. The bottom line was drawn days ago using a size 3 brush, and the top one was drawn today using a size 1 brush. The old one also somehow looks more blurry?
I've never used any other brush than the standard one in Photoshop. I've tried resetting all tools, but it didn't change anything.
I suspect something may have happened when I tried to double the canvas size the other day. Halfway through, I got an error message saying the scratch disk was full, so I cancelled the process.
Is there a way to make the brush work like before?

