I know =o I have no clue what I did XD
I use the paintbrush tool for my lineart =o and freehand it with said tool. Tis jus how I apply pressure that makes the lines come out that way.
I do that off and on too. You can look it up online to get them back to default or achieve certain results I believe =o You can also create new brushes in basic with the settings altered for insta use 8D *has recently done this*