Sprinklers are present on the Sheet tab, in the View but do not show when plotted.
Check the camera elevation in the properties of the View element.
The Cartesian coordinates of the camera are shown in X, Y, Z format here:
The elevation of the camera is the Z coordinate.
In the Model, use Verify Elements (Commands > Verify Elements) to locate any element that exceeds the elevation of the camera. Make a note of the ID.
*Make a note of the units used in both the Camera Position and Verify Elements. Conversion may be necessary.
Select then flatten or lower the offending elements.
Click Select > By ID... then enter the ID(s) of the elements.
Use Actions > Flatten to drop the elements to 0' or manually lower them any desired distance.