Toilet flushing too quickly
....if that makes any sense 
We have a Lunar Clubman 475 2k with a push button (electronic) Thetford cistern. Last year the toilet would flush with a steady, normal flow but this year there seems to be a higher and more forceful flow which tends to push some of the flush over the edge
of the toilet and down the side. Is there an adjustment that can be made or has something gone faulty.
Any help, much appreciated.
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