This has been put on the bug tracker: https://github.com/linuxgurugamer/ScienceAlert/issues/29
Meanwhile, you can switch ScienceAlert to the stock toolbar (e.g. via Toolbar controller, if you have it), to make the messages go away.
Guesswork: there could be interplay with Blizzy's Toolbar itself, as I also see similar messages for Persistent Rotation. And the message is coming from [Toolbar]...