I am not familiar with the model of toilet that you have, but many toilets suffer the same problem. It is usually due to the toilet cistern over-filling, as the water running into the bowl is the safety-overflow mechanism. The overfilling can be for a few reasons. The most common is that the fill valve is being held open, either due to mal-adjustment, or due to it being postioned slightly wrongly so that it hits either the side of the cistern or another part of the mechanism and can't close off properly. If you lift off the top of the cistern and watch what happens when the flush goes, you might be able to spot what is preventing the valve from shutting off entirely, and solve it. Hope this helps! :)
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