Charts look wrong

[cfpwastaken]

Describe the bug

The charts in the analytics look very wrong.

sometimes in the "big chart" too:

also in the big chart some time ranges show the lines in wavy and some in sharp: (last quarter: wavy) (last year: sharp)

Steps to reproduce

1. Go to the Dashboard
2. Click on Analytics
3. See funny graphs
4. (switch between last quarter and last year in the big chart)

Expected behavior

The charts should not "go back" on the x axis and they should all have the same style (wavy/sharp).

Additional context

No response

[brawaru]

The first part is a duplicate of #1582