My stuff is dissapering

I created a peaceful mode, survival, in the bamboo forest seed multiplayer world a couple of days ago and logged in today to find one of my sheep missing. I thought ok, maybe that was just a glitch,  then I logged off for a few hours and just now got back on to find that another sheep was gone and so was all of my blue dye from a chest. no-one has been on this world with me yet and right now it is off of multiplayer so it is just me.