Why do my posts get deleted?

Why when i create a topic about ranked mode and team racing mode my post gets deleted ?

Posts are merged to prevent duplicate topics from diluting vote counts and to help our data collection. Your post was added to the existing Ranked Racing topic in the Suggestions Hub:

Be sure to search for existing topics and add to them rather than opening a new topic with the same suggestion.
See Getting Started With Suggestions topics and pinned topics in each subcategory.