1) You should always save your settings after making a change and before slicing. Changed settings that have not been saved may not be applied.
2) IIRC the top & bottom solid infill patterns are only applied to the outer (top & bottom) single layers because they are purely for cosmetic purposes - all other top & bottom solid layers will be rectilinear.
3) If the top surface does not have a fairly large flat horizontal surface, the top infill pattern may not show up (e.g. on a dome, pyramid or sloping top).
Dave