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This is normal. Most silencers will cover a "trailing throttle" and you'll never hear it. How old is you muffler? It may be getting old and the packing might be deteriorating to a point where it is no longer absorbing as much sound. Most mufflers are packed with fiberglass, stainless steel wool, etc... When you come off the throttle the engine takes a load and the valves end up opening just a bit earlier. This dumps still burning fuel into the exaust. This is why you see some race cars (with open exhaust- and some without) shooting flames out the exhaust while under hard braking.

Like this Morgan at LeMans....
 
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