It seems that the order of metrics in the legend isn't deterministic, even though the same link is used.
This causes the legend to change on reload and change the link.
For instance: https://metricq.zih.tu-dresden.de/webview/#.now-1h*now*LZR.E00.EIN01.B82.L2*LZR.E00.EIN01.B82.L3*LZR.E00.EIN02.B82.L3*LZR.E00.EIN02.B82.L2*LZR.E00.EIN01.B82.L1*LZR.E00.EIN02.B82.L1