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Microsoft Windows 10 (64-bit)

Trying to print small envelopes on HP Laserjet Enterprise M605. The printer is leaving toner stains on the back of the envelopes. The envelopes are #6 3/4. The size is 3 5/8 inches X 6 1/2 inches. We have printed this size envelopes in the past on this printer with no problems. It prints on letter size paper and larger envelopes (No. 10) with no problems. Any thoughts on what is causing this and how to correct it would be greatly appreciated.

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