ore blocks are turned into terracotta

What I expected to happen was...:
When i accessed my skyblock after the beta version my ore blocks were turned into terracotta. When i left skyblock minecraft cubecraft went into beta. Then when i opend my skyblock my ore blocks that i collected in the version before beta where turned in to terracotta blocks. The blocks that are now turned in to terracotta are my iron, gold and emarald genarators.