strange chart drawing in Firefox

[sir-andreas]

Using the chart control I get some strange chart in Firefox (@MacOS Ventura):

When I open it in Chrome it shows like normal:

Do you have any idea how to fix that or what could be the reason?

[uwekaditz]

For me the behaviour with Firefox (@windows10) looks normal:

On my phone (Galaxy S22) with Firefox (@android13) it looks strange:

In both cases I use the same theme (ftui-theme.css) but it is also strange with the other themes (e.g. mobile-dark-theme.css)

Firefox versions:
Firefox@windows: 115.0.3 (64bit)
Firefox@android: 115.2.1 (Build #2015962859) from 2023-07-17