Welcome to PPRuNe epericolososporgersi.
The data on that, and other sites, is collected directly from the aircraft ADS-B signal but is then processed by the company. It is not unusual to see errors on these sites as they are NOT radar sites. I have seen aircraft flying 'backwards' and jumping back and forth between two locations thousands of meters apart!
I suggest you contact the website directly. Please do stay and contribute to the Cabin.