When using a starred letter to form a 5 or 7 letter word from a 4, 5, or 6 letter word, you can see the stream go to your number count but it will not show you scoring that number. You cannot go past the level since the counter does not decrease.
Any chance of recording it and sharing it here? A few others seem to have the issue, physical evidence always gets the ball rolling faster in order for this to be picked up.