There are many reasons for this:
- The most common reasons is the website loading time and 503 server errors due to a cheap hosting plan, or even of using a free/trial hosting plan, not enough server resources available (like RAM); if your hosting plan is overloaded then you should change it as soon as possible.
- Google Analytics and a lot of other tracking systems don’t record all visits, specially if the visits are under 1 minute. This is because some websites have slow loading time and users can leave your site before it finishes loading.
- Please avoid using any web traffic filters or related plugins, or captchas, cloudflare or other things that filter your traffic. The reality is that most visitors will leave your website asap since they have to type captchas and hence the visitor will not be counted.
- If Google analytics is not installed correctly on your site, or is installed in a couple locations of the site. This will affect the visitor count of your site. Please make sure that you DO NOT have Analytics twice on your site or before the Footer. GA should be placed before the < /head > tag. Placing the tracking code twice or at the end of the < body > code will miss visitors that click quickly through the pages.
These are just some of the reasons why you are not able to view all the traffic. Please make sure that your site is completely optimized and you will be able to view the majority of the visitors on your site.