FlashEff always makes my symbol move slightly when effect is complete

Everytime i use a FlashEff effect on a symbol, when the effect is complete, the symbol shifts very slightly. This always happens, and i end up not using FlashEff for this reason. Can anyone help?

Make sure that you are placing your flasheff target(symbol) at fixed position(the values for coordinates should be integers). The same applies to your symbol width and height.