It's a bug introduced with version 24.2 that should have been fixed with version 24.2.1.
What version are you using?
I'm fully up to date with v24.2.1 but still happens 😞
Did you rebuild the preferences after updating?
Does it still happen after you manually choose another align option (align to selection for instance)?
No Monika, my preferences haven't changed and I haven't found anything that would affect this.
Ahaa! Thank you Doug!
Purely having it on the "align to key object" setting is making it automatically select the top/front object as the key object.