V selections should be dedented before used anywhere.

[SirVer]

• :e temp.c
• iiftest;one;more;
• visually select the second and third statements inside the if with V, press if
• go back to normal mode, then oxyz;

You should get something like this:

if (/* condition */) {
   test;
   if (/* condition */) {
       xyz;
           one;
           more;
   }
}

one; and more; are not correctly indented.