DMA unexpected work on stm32g071

i want to use dma ch2 to response a request of Req_CC3 to load a new value to TIM1 CCR1 or CCR2 . i need dma in some turns but not always so i choose nomal mode. i'd like to know if dma request is  accumulated in stack or somewhere. cause every time i disable dma and reinitialize dma , the value buffered is been transferred  immediately,even if i clear CC3IF before i initialize dma.