"Do you like the orange and white tiger?"
Translation:Wyt ti yn hoffi'r teigr oren a gwyn?
Gwen is incorrect as teigr is a masculine noun.
I don't see that mistake in the course editor. You may be using an old version of the course with such an error.
If you want to access a more up to date version of the course one method is to delete your browsing history.
If you'd rather not do, as you might have lost of useful websites referenced then another way is to use a different browser just for Duolingo, eg the Vivaldi browser.