I am using Affinity Designer 1.5 and I've been having a bug recently where when using my Magic Mouse on some of the sliders, the sliders will start to jump around.
For example I was using the Angle tool in the Effects tab and all of a sudden it jumped to the offset slider and started to mess that up.
There is also another bug where the document/ art boards starts scrolling in a direction until I click the mouse again.
I've tried to see that if it's just the mouse or my system, but this is only happening in Affinity.
Another bug was that when choosing a font, it automatically