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The throttle opening back up makes sense after the injectors stop spraying fuel in a 0% accelerator situation. It will reduce lag the next time you press the accelerator down as it allows the turbo to keep spinning with less resistance.
Not sure I'd consider it a problem. The stock diverter valves were certainly designed with this in mind, so if your HKS setup has symptoms perhaps it's not the best DV/BOV solution.
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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