Zalera would be one of the instances of that site not being accurate. A quick check on the lodestone will show you >1,000 for Zalera, I'll be honest, I'm too lazy to scrap the exact number for that server myself, but just changing a few options shows they're over 10k.

Not sure why certain servers are so vastly understated on that site when others seems to be so accurate (Excalibur has pretty much been within a 5% margin everytime I've double checked it)

@Lithera, he used the lodestone data-scraping site, xivsoul linked earlier in this thread, I'm sure. He just neglected to check it for it's accuracy. As a tip, OP, if something seems to be a large outlier, it's generally a good idea to see if the data set is erroneous.