When this occurs, the page does nothing except flashing the typing symbol where I type the words/hiragana in, although it is already locked and shouldn’t be able to be typed in. I am able to type in extra letters, as seen in the screenshots I have attached.
I see you have some scripts running. Have you confirmed his behaviour persists when all scripts are turned off?
Any non script related bug is best emailed to email@example.com.
It appears to be occuring due to a script. Cheers for the heads up mate.
No problem ^^