I recently adopted a Rule where I would use a goal line formation on defense about 50% of the time when presented with a 3rd or 4th down and goal on my own 1 yard line. That was the only time I specifically mentioned using the goal line formation on defense by Rule. The probability of using it otherwise was always way less than 1% in all other defensive situations. However, goal line formation was called many times during the game, including 3rd and long. Did i do something wrong or is there a glitch? Thanks.

Unless you have a rule preventing it, your team will match a 1 or 0 WR personnel offense with a goal line defense, which is probably what happened.

That's exactly what happened. Thanks.