I recently installed ArcMap 10.3.1 to a new computer on a network. I have a map in a shared location which shows the correct symbology on my computer (which also has 10.3.1), but when the map is accessed from the new installation the symbology is all messed up for point features. For example, a fire hydrant showed a large number "4", whereas it is supposed to be one of the symbols that looks like a fire hydrant. If I search for fire hydrant in the symbol selector, the options are all wonky and include this number "4".
Any help in knowing what's going on and how to fix it would be greatly appreciated.