When you open the stats for a given week in https://www.researchgate.net/profile/Zeljko-Vujovic/stats, you will see a few of the readers during that week. However, users may unselect the option "Publication authors can see that I have read their publications" in https://www.researchgate.net/settings/privacy. Therefore, you will not see all readers. It seems to me also that ResearchGate does not display the complete list, but only a selection - but I am not sure about this.
In addition to what is already said by Wolfgang R. Dick I can add that if you go to your own stats then you can click on Reads and you find the number of Publication reads and if you click on Research Interest Score you find the number of (publication) reads by ResearchGate readers.
In my experience only 5-10% of reads come from RG readers, the majority of reads come from those who open the RG link of your page/publication from external sources (Google, Google Scholar, Zenodo, ORCID etc.).