HMAC validation failing on one product but not others

Hi,

We have a store which generates the HMAC validation form fields. This works perfectly on most products, but a couple are failing. Same site, same PHP to generate the code. Any idea why one would work while another fails? The only difference I can see is that the working products start with a letter, while the failing one starts with a number, but this shouldn't be a problem, or should it?
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