When I attempt to enter the hiragana it decides to vibrate and refuse to allow me to move past. Even when I have the correct ones or the wrong ones I can’t enter them at all.
I do not have any userscripts installed, but do have adblock via ublock origin.
Can you give more information? Maybe post a screenshot.
Maybe I have misunderstood something, but given that your title is “Kanji meaning issue” and that you wrote “…enter the hiragana…”, are you perhaps writing the pronunciation instead of the meaning?