Cache size is enormous

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Hello, my WordPress blog has less than 900 articles but the cache size is enormous: 3,5 GB. Is it normal? If yes there’s a way to reduce the size? It always increases and the space on my server is ending.

Also look at this image:

When i open a folder in the cache it starts opening always the same folders, like a loop. This is normal too?

IMG link in full size: http://i.imgur.com/oBNKHXh.png