When moving the vertical cursor on the graphs, the little “info box” stays to the left of the cursor, until there is no more room for it, then moves to the right of the cursor. Good!
Unfortunately, as soon as the cursor is then moved to the right, the info box jumps back over to the left.
If one moving the cursor around that point, the info box jumps left and right.
Enhancement: Add hysteresis to the left/right decision, so that the box does not jump back over to the left side of the cursor, until there is no more room for it on the right side of the graph.