It's not a culprit, it's a feature!
Being able to automate volumes by drawing lines is pretty cool, until it happens accidentally shocked
Glad I could help.

FWIW, another way to do that is to go to the Mixer view and 'Record Mixer Moves'.
For some this is more intuitive, for others the line under the Tracks is more what they like.

It's all good once you understand how it works.


Make your sound your own!
.. I do not work here, but the benefits are still awesome