You do not mention what field this was in? If in the title then the only way is to add any required leading zeroes as the field is simply sorted as text. There must be enough leading zeroes to cater for the highest issue number.
I use the Series fields for magazines and put issue numbers into the Series Index field (I actually tend to use year.issue eg 2011.03). Sorting on the series field will now give expected results as the series-index field is sorted numerically.
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