Some managers' direct reports structure display differently compared with others in Org Chart.
Reproducing the Issue
1) Go to View Org Chat
2) Find a manager who has less than 16 direct reports
3) Find a manager who has more than or euqal to 16 direct reports
It is by design.
When a manager has 16 or more direct reports, the reports will be arranged in a tighter way as shown in the second screenshot. Whereas if a manager has less than 16 direct reports, it will display more nicely in a row as shown in the first screenshot as there is enough space. This is by system design and you cannot change or customize the way how they are displayed.
Org Chart display, reports arrangement, Ort Chart hierachy , KBA , LOD-SF-PLT-ORG , Org Chart Issues , How To