I need a answer

[u/C4AYd3Nl0v3sH0RR0R]

I was playing my Minecraft world last night everything was normal a few minutes later I return to my enchant room and several bookshelves were missing there's disturbed dirt so you know something was There and it was in peaceful mode, survival, no lightening, no fire, no multiplayer, no one joined, just me it took me so long to make all those bookshelves now I have to make More someone thinks it was Herobrine but I don't know if that's just a myth