Pen tool issue - sort of autocompletion with pixels

Hi, I’m new to pixel art and Aseprite! I really like the tool.

I’ve noticed an annoying behaviour that I don’t know how to turn off.
It’s hard to explain by words but it’s like, while drawing a line keeping pressed the pencil tool, that more pixels are added when I release.
It’s pretty frustrating because it’s never what you really want and you spend quite a lot to recover from that.
It looks like it tries to “close” an imaginary path from start and end point.
I tried with pixel-perfect ON/OFF but it’s the same.

Here’s a recording:

Well, just found out what was the issue: I pressing using the D (Contour tool) instead of B (brush tool) :slight_smile:

Sever case of PEBKAC