I am on level 40 and am entering words with 5 and 6 letters.  They are accepted on the board (even commented on) but they are not being credited thus not allowing me to move to the next level.  For example, I am to find 13 words...the first nine are accepted fine, but the last ones are not credited thus having me run out of moves...I have tried to get through this level a dozen times.  What is wrong?