Vertical bar position on Demo Audio Effect does not match their values when using two sibling Audio Groups with the same Demo Audio Effect on

How to reproduce:
1. Open the “VerticalBarVisualBug.zip“ project
2. Open the Audio Mixed tab
3. Create two sibling Audio Groups
4. Add an effect “Demo Equalizer“ to both groups
5. Move any of the vertical bars in the “Demo Equalizer” effect on one of the groups
6. Observe the “Demo Equalizer“ position of the vertical bar on the other Group

Expected results: The moved vertical bar position represents the value shown below
Actual results: The moved vertical bar position is the same as the previously moved vertical bar position

Reproducible in: 2021.3.35f1, 2022.3.20f1, 2023.2.13f1, 2023.3.0b10

Reproduced on: Windows 11 (23H2), macOS 14.1.1 (M2) (By reporter)
Not reproduced on: No other environment tested

Notes:

• The horizontal curve has correct curvature
• The issue is also reproducible with other Demo effects that have the same kind of vertical bars
• Does not seem to be reproducible with the Editors stock effects