The water droplets may appear on the garments when you have steam ironed for a while. This happens because steam has condensed on the ironing board.
Dry the wet spots on the garment and the ironing board cover by passing the iron over them without pressing the steam button. If the underside of the ironing board is wet, wipe it dry.
Make sure you use a mesh-top ironing board with a thick felt material as this minimises steam condensation on the ironing board.