Let's talk about Primer[Warning Spoilers]

[Heat]

So yeah i will allow spoilers but yeah the whole gist of it their time machine also goes back in time and forward.
When they go back they make clones. Also they were jumping around in time so much that they caused different outcomes
and different branches of timelines. With that happening you have the clones making more machines opening up more time lines
and you have the third guy who shows up Granger all because of  Abe 1.

The time machines don't create clones, and they don't allow you to go "forward" in time. Rather, they allow a traveler to travel from a point in the present back to the point when the machine was turned on, and then back to the present. You can't use the time machine to travel further into the future than you were when you got into the machine.

As for the clones, that's not what happened, it's just that because you get in the time machine in the present and get out in the past, for the hours in-between there exist two versions of you, until one version gets in the time machine.

This diagram explains it:

https://en.wikipedia.org/wiki/Primer_%28...thod-2.svg

This is correct.

However, I would be curious and implore you to theorize what would happen if during the time there are two versions of you, one version prevented the other from entering the time machine. It works like this, if you travel back in time, your 2nd version will do the exact same actions as you did, so you got in the time machine, when that time line reaches the time you got in the machine your 2nd version will get in the machine as well.

At least I think. I haven't watched the movie in years but I remember it quite well.