Thank you for your report. Which browser are you using? Hope that my new update has fixed this bug as I don't have two clicking devices to reproduce it.
I am using Edge. The bug is still present. I don't frankly know how you could fix the issue. Perhaps making a seemingly redundant check for if the button is already pressed when you try to click again? IDK. I only found the glitch by chance since I'm using a laptop with a trackpad and a USB mouse. Again, it's probably an extreme edge-case that isn't worth fixing if you have literally anything else to do. But I wanted to bring it to your attention just in case.