When clicking onto another data screen on spotifytrack.net, and then returning to the graph, the labels are messed up. They render as plain black text (on a bla

When clicking onto another data screen on spotifytrack.net, and then returning to the graph, the labels are messed up. They render as plain black text (on a black background). Maybe that Sprite caching trick has some failure modes? The sprites also look janky when zooming in, because they remain low res.