Data sampling

Data sampling

Hi, 

I've been using Zoho for a while and one of my table shows the metric 'monthly visits'. When I saw the value for visits in Nov right after uploading the data the number was  24,578. A month later I see this number and it has turned into  25,108. 
Does Zoho sample data by any chance because of which the number can change by a few hundreds every now and then? (Something similar to Google Analytics?) Or is this a bug?

Thanks for the help!