Why does the counter not go to 8 and 9 when Ctrl+a used in vim?

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Issue

Open vim in Red Hat Enterprise Linux 6.5 and write something like test0001, and then press Ctrl+a to increase the counter, if the Ctrl+a is pressed seven times, instead of getting test0008, it shows test0010. Why the digits 8 and 9 not considered here? Is it a bug?

Environment

Red Hat Enterprise Linux 6.5
vim

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