Hi ! im sad to announce i've been having this glitch on fresco since forever on Windows PC. Some brush strokes as soon as i lift the pen they break off leaving a tick mark. This is not from my movement because i am able to do excelente linework in other drawing softwares with no issue including Clip Studio and Photoshop among others. It happens with every brush but the pencil sketch one, im 100% sure this a software problem and it may have to do with the fact that it a universal windows app because i have no issue with other softwares. I use two monitors with one being 144hz and a wacom tablet maybe that has something to do with it i dont know.