funny thing this happend to me same situation today.
think it has to do with the transmission/gear being caught at a specific speed between shifts.

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2012 X6 ///M Sapphire Black/Black Pref Full Leather
2007 Alpina B7 - Alpina Blue II/Creme SOLD
2004 X5 4.4i - Toledo Blue/Grey SOLD
1994 300ZX TT - Black/Black