Reviewing Urdu samples- problem with swipe/yes/no

I am the following URL to review Urdu sentences
But the page buttons for swipe or keyboard Press of Y or N seems not working correctly As the buttons on the page disappear once I press them. I tried this in Chrome and IE. Same issue. Plus once a sentence is reviewed, does it need to appear again for a review? I keep getting the same sentence when Page is refreshed. Its like doing it all over again.

This was reported before in the Matrix chat, but to this date I’m unfortunately not able to reproduce this.

Are you submitting the review by clicking the “Finish Review” button on the top left?

Ok so the button issue is still there.
Oh had to finish the review, Got it Thank you for the response.

Kind regards