I have pinned the tile on the main Brave page for the DuckDuckGo search engine.
Also pinned three other tiles for a total of four
I use DuckDuckGo a fair bit and today a second tile for DuckDuckGo showed up on the main Brave page.
I think the software should recognize that there is a tile for DuckDuckGo on the main page already and not create a second one.
Probably not easy to reproduce - maybe pinning DuckDuckGo and then continuing to open DuckDuckGo many times.
I have a screenshot but there doesn’t seem to be a way to add an image here