Chris Riddles

As you can see i am a newbie on these forums, yesterday i purchased a BIG FARM HOUSE,700.000 , i put it on my farm 2 but decided that i wanted it on farm 1 so i put the BIG FARM HOUSE into storage, after i made room for it i went to my storage and the BIG FARM HOUSE had turned into a normal farm house, how did this happen ?.
The space where i originally placed the big farm house on my farm 2 is blocked i can not use this space, this smaller farm house is now on my farm 1 (i already have two of these small farmhouses and do not need a third) but it should be the BIG FARM HOUSE, please can any one give advice as to what happened, thank you so much Chris x