Have you changed DNS of your website recently? Remember that DNS does not change quickly around the whole world it took up to 48 hours to for full DNS propagation. It might possible you can see the newer version of your website, but mean while there is a possibility someone still browsing your old website.
To check this you have to confirm that even your DSN propagated fully in all regions of the world. Our DNS propagation checker tool can do this job for you. It checks DNS propagation from the following locations