Hey @Rishabhrajan,
The fixture profile looks good, the issue you are describing is most likely due to how the fixture is tagged. To get full control of the fixture, assign separate tags to the fixture base section (e.g. Bar Main) and all the cells (e.g. Bar RGB). When you assign a tag to the fixture base, tags will automatically also be assigned to all the cells, so you should first remove that.
In Live, use a dedicated device for each of the two tags - one to control parameters that apply to the entire fixture, and one to control fixture cells/pixels. You can set the main intensity to always be at 100%.
You should now be able to address each of the 8 cells/pixels individually.
Let us know if you are still experiencing issues.