HighCharts Debugging and Customization in React

I need an expert in React and HighCharts to help me with a few tasks:

- Debugging my current React code that integrates HighCharts. The issues I'm facing include:
- Marker-related issues that involve displaying top 5 markers on one button click, and another set of 5 markers on another button click.

- Implementing changes in the HighCharts graphs:
- Adding data labels to the graphs.
- Customizing tooltips on hover.
- Dealing with spacing and trendline issues between data points.

The ideal freelancer for this job should have:
- Profound experience with React, HighCharts, and frontend development.
- A solid understanding of marker issues within HighCharts.
- Proven experience in debugging complex React code.

Your work will be crucial to ensuring my applications' charts are accurate and visually appealing.