Your question is Visualizing Late and Out-of-Order Streams. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You need to visualize live data streams where records can arrive out of order or with uneven latency. The challenge is to keep charts responsive without misleading users when earlier events arrive after later ones.