TicTacToe - Cross and Circle blinks randomly

Hi,

I am new in libGDX, I was trying to create very simple game TicTacToe for learning purpose. My problem is when I click on the cell of the board, it blinks between Cross and Circle randomly. What I wanted is when we click the cell, cross and circle appear alternately. Here is my code http://pastebin.java-gaming.org/6fe648a403617

Thanks in advance

Cheers