Reinstalling Rocket League can sometimes fix odd problems. You will first need to uninstall, then redownload Rocket League (This will not delete game save data).

To uninstall Rocket League:

1. Highlight Rocket League on the Home Screen on your Nintendo Switch
2. Press the + button on the right Joy-Con to open the game's options menu
3. Select Manage Software from the menu on the left
4. Select Rocket League, then select Manage Software
5. Select Delete Software
6. Select Delete when asked to confirm that you want to delete the game

To re-download Rocket League:

1. Select the eShop from the Home screen
2. Select the profile from which Rocket League was originally purchased
3. Select the Profile in the upper right corner of the eShop screen
4. Select Redownload from the menu on the left

Select the download cloud icon for Rocket League