Oh dear!
I’m not sure what might be happening there, so I have lots of questions.
So when Control is held down, no tags can be selected at all, is that correct?
If you select a tag, without control held, and click a different one with it held, does the first one become deselected, or does nothing happen? Does Deepdwn stay focused when you do?
If you click a selected tag while control is held, what happens?
Do you have any other apps that might be interfering with Ctrl+click?
Are you using an external keyboard?
Can you tell me what you see when you click the button here with Control held? With Command?
https://cdpn.io/billiam/debug/bGoaGJw/LDAmdnYmeyxr
Thanks!