I can't always see all the choices for words in the correct answer. They seem to be below the line. There is also no way to state the error. I guess that button is below my screen also.
There has been an increasing number of complaints regarding missing word tiles since the new design was introduced. Unfortunately, there's not much I can do about it - but there are some things you can try. First, try zooming out in your browser, this will usually cause the missing tile(s) to reappear, and you can then zoom back in after answering the question. If that doesn't help, I encourage you to submit a big report here: https://support.duolingo.com/hc/en-us/requests/new