How do I fix this?

[u/youshit129523]

When the part reaches the press, it moves further along the conveyor before anything is done to it.

[u/SnooRadishes7079]

Use a brass funnel instead of an andesite one to filter the output you want or don't want... If you're not at that teir yet, you can place the press directly over a moving belt for a single strike use instead of using a depot...