Hadley Rille
"Although broadly useful FR24 data is wildly inaccurate at the detail level. I've observed my own flights on FR24 in real time out of curiosity and some of the manouevres it showed would have broken up my aircraft and had me busting controlled airspace."
If you're seeing erratic tracks for your own flights on FR24 then, assuming you're flying any commercial jet built in the last 30-odd years, you really need to be having a chat with your airline's Engineering department.