Dog bonded to me and not my partner

So my fiancé and I adopted a puppy a few months back and we’ve noticed that she has a lot of separation anxiety when I leave, but not when my fiancé leaves.

We separate the care of the dog fairly equally, I handle the mornings ( feeding, playing, walking, etc) and she handles the afternoon as I often get home late.

When I leave, the dog tends to misbehave, she cries a lot, and doesn’t listen much to my fiancé. But it doesn’t really happen when I’m around.

We both do roughly the same things for training and rules in the house, so we’re at a bit of a loss as to why our dog acts like this only when I leave.