handles are disappearing for no reason

For some reason, when click on width handles and drag them, trying to change the width of an outline, the purple width handle disappears and the layer deforms. I have not had this issue until now and have no idea why this is happening.

Hello welcome to the forum.

Can you precise the os ; synfig version ; does that happen for any project … how to reproduce … make a screen cast maybe ?

How to report a bug effectylvy : chiark.greenend.org.uk/~sgtatham/bugs.html