Hey, i've got two Hermann Tortoises which are three years old, but one seems to be outgrowing the other. One is 4inches long while the other isn't even 3! I'm getting worried. Is this normal or is something wrong!?

This can be quite normal sometimes it can be down to the sex's as females are sometimes bigger than male's, as long as the smaller one is active and eating well I wouldnt worry.
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Welcome to the forum Miggs. I agree. I would monitor the activity levels and if they are active and appear healthy I would not worry too much. each tort grows at their own rate, and of course slow and steady is the key.