Without seeing your even sheet or capx file I would guess it has something to do with multiple instances of the same sprite.
A totally blind guess would be to assume you are dropping the red block through the gaps in the white ones. If so, try making the white ones different sprites and deciding which to move based on the position (Y value) of the red block.
Is that making any sense?
Hi , thanks for help
Yes I'm trying to move the red one through the gaps.
As you can see in my event sheet I'm trying to make two groups of white rectangles, leftblock and left block 2 (cause there will be no more than two blocks on the layout at the same time) ,and the right blocks are positioned to them every thick. now I'm just trying to spawn the groups one after another to see if it works.
This is the original game : gameeapp.com/game/yKaQa9ti