SUMMARY
The system monitor application has a graphical bug where if any line chart has two or more sensors horizontal lines will form on the y-axis lines. The glitched lines will use the colors applied to the sensors in the line chart. I have restarted the application and my system, as well as checked for updates, and this problem remains.

STEPS TO REPRODUCE
1. Open System Monitor
2. Create a new sensor with the Line Chart mode.
3. Add CPU core usage sensors individually (red for core 1, orange for core 2, etc). There must be at least two.
4. Save changes.

OBSERVED RESULT
I used a Line Chart graph with 8 cores and a graphical bug resulted in perfectly horizontal lines being drawn above and around the sensors data within the graph itself. The lines are spliced up and spread out and lie perfectly on-top of the y-axis lines. And they do not extend past the boundaries of the graph. Enabling or Disabling any of the check-boxes only changes the entire graph equally including both the actual data points and the graphical glitches. In other words, despite the settings, the bug and the actual data seem almost in fixed point to each other. This bug was not limited to CPU cores but this displayed it the greatest in my opinion.

EXPECTED RESULT
The Line Chart should behave as normal, displaying all 8 of my CPU core sensors. Each one should be given a specific color. and should not overlap with one-another.

OPERATING SYSTEM
Arch Linux

SOFTWARE
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.7.8-arch1-1 (64-bit)
Graphics Platform: X11

HARDWARE
Processors: 8 × 11th Gen Intel® Core™ i5-1135G7 @ 2.40GHz (4 core with hyper-threading enabled)
Memory: 7.4 GiB of RAM
Graphics Processor: Mesa Intel® Xe Graphics
Manufacturer: HP
Product Name: HP Laptop 14-dq2xxx