Click the upper line of the legend in other to make it go away, chart is zoomed not only down but also left. Notice the red line disappearing from the zoomed chart. Notice yaxis going crazy.
Click the upper line of the legend again in order to make it come back, chart tries to go back to the initial zoom, maybe accomplishes that, I don't know, but lines alignment have changed. Notice yaxis not going completely normal.
Either the first chart or the third chart are wrong data.
This is Opera 62.0.3331.119.
Can reproduce using Firefox Quantum 68.0.2 and Chromium 47.0.2503.0.
This is macOS 10.14.6.
How this is different from http://meta.stackexchange.com/questions/296884 (even likely related to, root cause might be the same but manifestations are different).
If I double click lines in legend, this happens. Dis-adjustment seem to be larger than in my initial report. Notice yaxis acts weirdly in a very similar way to my initial report.
As a notable difference, what I report causes a JS console red message. Contrary wise, Network reputation graph becomes nervous when clicking quickly, backs away slowly not (that one doesn't log anything at all when being reproduced):
highcharts.js?v=61b1d1bf4167:12 Error: <path> attribute d: Expected moveto path command ('M' or 'm'), "0".
r @ highcharts.js?v=61b1d1bf4167:12 attr @ highcharts.js?v=61b1d1bf4167:297 c.<computed> @ highcharts.js?v=61b1d1bf4167:258 X.h @ jquery.min.js:3 X @ jquery.min.js:3 n.Animation.n.extend.tweeners.* @ jquery.min.js:4 nb @ jquery.min.js:4 map @ jquery.min.js:2 qb @ jquery.min.js:4 g @ jquery.min.js:4 dequeue @ jquery.min.js:3 (anonymous) @ jquery.min.js:3 each @ jquery.min.js:2 each @ jquery.min.js:2 queue @ jquery.min.js:3 animate @ jquery.min.js:4 ec @ highcharts.js?v=61b1d1bf4167:257 animate @ highcharts.js?v=61b1d1bf4167:291 render @ highcharts.js?v=61b1d1bf4167:72 (anonymous) @ highcharts.js?v=61b1d1bf4167:61 o @ highcharts.js?v=61b1d1bf4167:254 m @ highcharts.js?v=61b1d1bf4167:61 redraw @ highcharts.js?v=61b1d1bf4167:101 (anonymous) @ highcharts.js?v=61b1d1bf4167:157 o @ highcharts.js?v=61b1d1bf4167:254 h @ highcharts.js?v=61b1d1bf4167:155 setVisible @ highcharts.js?v=61b1d1bf4167:561 a @ highcharts.js?v=61b1d1bf4167:190 Z @ highcharts.js?v=61b1d1bf4167:257 (anonymous) @ highcharts.js?v=61b1d1bf4167:190