Have you selected or uploaded custom icons to display against your places via the ‘Maps and Markers’ section, but they’re not showing up on the map?
Make sure you have turned off ‘Numbering'. By default, the places are numbered in sequential order, so you will need to turn this off in order for your icons to be displayed instead of numbers.
How do you turn off numbering?
Under the ‘Plot Locations’ section in your right hand panel, click on the ‘Numbering:ON/OFF’ link.
Then toggle to ‘Unnumbered’.
Don't forget to 'Publish' your map after you have made the change.