Chests have disappeared along with all contents, plus all animals

Logged into game and all6 chests have gone with items. We clicked in empty space and a small chest reappeared but was empty and sometimes these were double. Playing for a year or more so had loads of diamonds, gold, ore of all kind, red stone, coal, steel, food wool, tools etc, animals in barn also gone but new animals now scattered over island (dint have pigs but do now so respawned) gutted as mined for hours!!! And we're making tracks and about to do another reactor, seed 1375122145