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I am using auto number field not generate continuous number

As of i am using auto number field to generate new number .But when some validation rule error or flow error occur .The number skips some numbers in the middle. 

Suppose in my number auto number says : 205 

On the next insert record if validation rule or flow error occur .It will be changing auto 205 to 208.
I dont know why it is not generating in good way,Only record inserts it should generate number and why it skips number due to errors.