remove faint line above x Axis on charts

[rachel-labri-tipton]

Pull Request

Description

Removes weird line above second x-axis on chart. There shouldn't be a line above the second x-axis in this chart. Please, @braddf, let me know if you see one.

Fixes #

How Has This Been Tested?

Code was run locally.

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings

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