Skyblock problem

[Morronicine]

I am currently the only person on my skyblock island. I was alt-tabbed at the time and when i got back to my game, some of my trees were cut down and all my saplings were gone. Can anyone tell me what is going on?

[Morronicine]

Nvm. the culprit was my own lack of knowledge. how was i supposed to know putting trees close to lava would catch them on fire XD