When using AutoGlobalFilters="True", the user is able to click certain types of visualizations, like charts, to add or update a global filter. For example, if there is a bar chart with bars represented by country. Clicking the USA bar adds a global filters of Country=USA. Plus, the chart's USA bar is highlighted in a different color.
Set DisableGlobalFiltersFromPanels="True" to prevent chart clicks from adding dashboard global filters.