Weird problem – Ninja Fishing Review

The game is fun and is very addicting but I encountered a problem that may or may not be good I was going to buy the no dynamite katana because I hate hitting all the dynamites when I catch good fish so I tapped on it and nothing happened I tried everything but it wouldn’t let me buy it is this a bug or a glitch?
Review by skippingbeesknees on Ninja Fishing.