Hi @Chardonneaur, sorry about this. It's indeed a bug, as we can easily reproduce it on the demo site here. After the 3rd click we get only flat graphs.

I set this issue as bug so we can hopefully get things sorted soon.

I think this is related to the issue I called attention to in the forums https://forum.matomo.org/t/acquisition-overview-multiple-bugs/41308 and possibly as far back as 2019 https://forum.matomo.org/t/3-13-bug-in-acquisition-overview/35248

But I noticed the bug when I opened the pulldown above the graph that allows you to select Records to Plot. Doing so eventually causes all the graph data to flatline to zero, and it also seems to result in URL-encoded characters in the 'records to plot' labels.

This is also reproducible in the demo site.

i could reproduce the issue, steps:

• Go to demo
• Under evolution graph click on the sparkline eg. 1,620 from search engines, 56% of visits -16.5%
• the graph loads correctly
• then click again
• got: the graph is now empty
• expected: the graph loads correctly

(fyi: In some other cases I get a different issue, but i couldn't exactly reproduce it, where the graph label appears double encoded, see screenshot below. this issue might be automatically fixed when we fix the above)

This could possibly be fixed with #18016

It is fixed 🎉