The words in each grid have a theme and order: the game starts off easy, but the size and number of words increase as you play, and the order becomes more important and difficult.
That’s not a bug! If you can’t connect the letters it’s because you have solved the words in the wrong order. In that case start over using the reload button and try to solve the words in a new order.
Mods on word games you can find at modsapk.com