Why did water flow out of my rice cooker when it was cooking?

I always used to watch my mum and I followed what she did.

Yesterday, I poured in 4 cups of rice. THen I filled the water to the 4 cups level (definitely the 4 cups,i checked and checked again).

SO i turned the appliance on, all was well, but after a while, water started to pour out! and then I had to open the cover and close it again to let it recede. But a lot of water flowed out!

Why did this happen and what can I do to prevent it? thanks.
 
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