Human error mostly! best way i can explain is an analogy.
Imagine handing someone a calculator. Technically now, they should be able to solve maths problems with complete accuracy. However, if you ask them for 1,000 calculations a day, theres a chance that hes going to accidentally miss-type one of the numbers and not realise. This would be the equivalent of someone not checking an expiration date, or noticing a tear in a condom, missing a pill…. very little things, that are out of the “births controls” control.
I mean, without getting too graphic and into things, some fluids come out before you finish. This can get on your finger and from their into other places. People think its a joke, but it is possible. Highly unlikely, but still possible!
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