Mason mitre joint help

I’m new to the kitchen fitting game. It’s. Le come to worktops and I’ve been watching my trainer loads. And videos. I keep practicing at home. I till it’s my turn on site. But I can never seem to get the joint right

Any help?

With the female it’s always right! (Hard to get female wrong)

But when I do the male it never seems to line up bang on how I like it too. And I feel I’m doing all the parts right

Any help. Any tips? What do you all sugguest