Issue with Kiwa Oli WC Oliver International Diamante

We recently bought house and within few days water started leaking whenever the flush is used. Flush is not stopping the water leakage.

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What I think there is too much water in the reservoir, you can adjust it by the float on the straight side. Now the container fills up and overflows through the middle pipe and so the toilet only stops in it when you turn off the main tap. Translated via google
 

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