O_o...that's definitely not good lol
Did you try closing your game and restarting in case its a glitch although its unlikely...Have you been messing around with the acacia tree files at all? It's possibly they got missed placed or deleted especially if you're a map maker or adding mods and you replaced anything. Best best is to uninstall the game and delete the Feral Heart folder before reinstalling. That should fix your tree issue if your files are messed up. Just be sure to back up any important files like maps, presets, and screenshots before uninstalling.