Dear @asacur,
I asked the core team for support and got assistance from @Markus. It turns out that it isn’t a but. The relationship will appear in both profiles if its type is “bidirectional” and to change that setting go to Maintenance → Program → Relationship Type → choose the relationship ship you are using and make sure that directional is checked as in the screenshot below, save the changes.
Give this solution a try and if it worked then let me know, please! Thank you!