Are you using Vimium, or some other extension that listens for the ` key? If so, you should be able to fix that problem by either rebinding the Backtick hotkey to something else in the settings, or by unbinding the ` key from the given extension.
If you're using Vimium, add "unmap `" to the custom key mappings in the advanced options.
If you're using Vimium, add "unmap `" to the custom key mappings in the advanced options.