strange command block behaviour

i've noticed when building a command block computer that if you have chain command blocks linked together and they command blocks are each executing the function command. it seems as though all these function commands are getting executed at the same time. this can cause scoreboard values to be overwritten at the wrong time causing issues, i'm not sure if this is intended behaviour but i just think it would make more sense if the chain commands blocks wait till the function command has finished before moving on.