Can currently include and exclude the same tag, leading to no data.

Easy to see you've made a mistake when there's only one tag, but if people are putting twenty on might be hard to realise what's happening.

Some sort of blocker or Pop up that says "XBTUSD is already in 'Tags included', are you sure you want to add it to 'tags excluded'? This will remove it from 'tags included'"

On that note Included Tags and Excluded Tags seems more natural to me than Tags Included