"There are two yellow taxis in the square."
Translation:Υπάρχουν δύο κίτρινα ταξί στην πλατεία.
It gives βρισκονται correct but not υπαρχουν. In a previous exercise it would not allow both options - this is in strengthening
Yes, that seems to be a problem. Apparently, some changes don't apply to strengthening. I just put the phrase with the verb "βρίσκονται" in a different sentence, not as a best translation, as an alternative one. Let me know if it gets accepted next time.