Radioaktiv3

I and my friend are playing on our own Server. We are playing and having a nuclearreactor (2 uran zells , over 10 Stacks ice(with auto refill)) runing after about 10 min we look for it and our Mk3 charingbench, 1 timer, 1 Energy Condenser, 4 reinforced glass(or so i dont know th name correctly) were gone! Why ? pls help we dont want to cheat ous these things so im asking is it possibel that a Enderman grift these things or the reactor overheated ( not realy possible) or somthing else. Sorry for my bad English its not my netaive language ;D