Quarantine Bug

I don’t know why this is happening but I need some help.
This does not always happen, if this happens I reboot and it gets normal usually(at least until now).
If I go to Avast One Quarantine page, and click ‘add threat’, well it does nothing. Usually a dialog box with selecting a file appears, but this time it doesn’t appear.
Before, If I rebooted, this got fixed. I’m just going to reboot now-
Does anyone know why this happens?
Hope this bug gets fixed, though.

Not able to reproduce on my side.
Please try to repair it ( Account> Settings> Troubleshoot> “Repair Avast One”)

But I don’t really know if it’s serious…
If I reboot it is all normal.
Though thanks for your advice.
I am planning to uninstall One and install Avast Free Antivirus.