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Humm, I'm puzzled by that piece of code in /user.php. Seems the op is missing. It should be
redirect_header("register.php?op=actv&id={$id}&actkey={$actkey}", 1, '');
Can't understand how the user here has become activated.
So, I retested to be sure.
It says 'Take you back to where you were' and then continues with /modules/profile/activation.php?..., so it seems when profile module is active /user.php got intercepted by /modules/profile/user.php, but don't see how and where, and there the op actv is not deprecated???
Anyway the link is working here due to the profile module.
Do you have the profile module activated? What happens if you click the link? Can you try the modification of /user.php?