flight receipt and confirmation

I've just been into my inbox and found I've been re-sent both my receipt and flight confirmation (for April). I'm puzzled as to how this has happened - the only times I've ever had this happen is when I've requested the info again - and I haven't this time. There was a minor flight time change a few weeks back, when I did request and get the updated info - but I have no idea where this has come from.
Any ideas anyone? Is it something I should be concerned about?
Any ideas anyone? Is it something I should be concerned about?