I do have a similar issue with my White Whale's screw holes - they don't align to my rails, so I have to shift the module a bit to the right and I lose 1 HP.
Here's what it looks like with my µZeus + any of my other module (here a MI Branches):
Things are aligned.
But with the White Whale, it's not aligned:
Note that with the Switch, it's aligned:
Am I missing something here?