My worlds are broken

This world was all good no bugs for a whole month (almost two) then bugs started. The world started to get glitched with hunks of are stronghold just disappearing in our faces, the builds we had reset parts too different times in our world and reset chest. Capes and skins don't work in this world, they either give flood are screens with error reports or everyone is a Steve (sometimes Alex). I died randomly and it would not say how and the rest of player all saw me fall in front of them even though only three saw were with me (7 player were on). It was in peaceful on invite only and I died. The world has time different in every place, sometimes it's in the right time, other times it's at the state it was a 2 months ago or three weeks ago. it is messed up.