Command blocks when using the /execute command do not work properly

I found a glitch in the latest vanilla 1.20.4 while making a commandblock train i wanted to use minecarts as the thing to move the train. And the command blocks had the /execute command to clone an stationary train to the another position but always when a minecart was existing the command blocks were cloning the train to their position, not the minecart's one. And the command in the command block that was runned by minecarts is:
/clone -70 -59 -12 -65 -56 -20 -76 -59 ~