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Because the shaft(s) in the gearbox are still spinning and the reverse gear typically doesn't have synchromesh to equalise their speeds as it engages.

The shaft(s) are still spinning for one of three reasons:

a) the clutch friction disc has not fully released from either of it's mating surfaces

b) the oil in the gearbox is the wrong grade or quantity

c) you are trying to shift into reverse too soon after disengaging the clutch

Anti-sieze compount (e.g copper grease) on the input shaft splines may cure (a) if the clutch pressure plate isn't faulty and the clutch cable (or hydraulics if used) are correctly adjusted. (b) is unlikely unless the gearbox has been leaking or it's had it's oil changed shortly before the problem began.

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