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Why is my mower backfiring?

I have a zero turn Husqvarna that will start up and run great. No problem riding around, but whenever I engage the blades and start to cut, the engine backfires. I will also say that this happens in places where the grass is high

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A spark plug that is damaged, worn, or has an improperly set gap between its electrodes creates a weak spark. As a result, the fuel may not ignite in the cylinder, but it might ignite when it reaches the hot exhaust muffler. The result is a loud backfire. Poor spark also results in a mower that runs unreliably.

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But why does this only happen whenever the blades are engaged and cutting

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