So I've been having this issue ever since I started using a tablet, and have finally had enough.
For some reason, after drawing lines or even just dots on my tablet, occasionally the line/dot will thicken and become 100%
opaque a split second after I remove my pen from the tablet, regardless of it's previous thickness/opacity. This is an
especially annoying issue when it comes to shading or blending. Oftentimes I'll be working on tiny details when suddenly a
solid line just pops up on my drawing. I know it's not my tablet's problem, as I've changed tablets without the issue disappearing.
Can anyone help?
I use an Intuos Pro Small, if it matters.
You say you have changed the tablet, but what about the driver? It sounds like inconsistant line thickness, which is a known Wacom driver issue. Make sure you have the latest driver for the tablet and see if that fixes things.