On copying a single item to the clipboard, CopyQ 4.0 on Windows repeatedly pastes in multiple clipboard items.

CopyQ 4.0 is causing major issues for me on multiple Windows devices and has become very unreliable because of random behavior. Allow me to explain:

On copying anything to the clipboard, and also when scrolling through a CopyQ tab, CopyQ immediately starts pasting multiple items from the tab to the active window as plain text, resulting constant flashing of the CopyQ window and – even worse – a big mess of items being pasted in.
Sometimes it pastes in a single item as plain text, sometimes multiple items. I then need to clean up the active window, go back to CopyQ, manually copy the just copied item again, and only then it will paste as image or HTML.

Reverting to CopyQ version 3.13 doesn't fix this issue.

Do we know what causes this? Does anyone have a solution? I rely so much on CopyQ and would really like to fix this.