Could be pre-placed objects. One of the units on the map might have that type as a name. Change the type of that unit by deleting all instances of it, copying it with a sensible type name and then placing all of them where they were. This might be a JASSHelper bug with respect to odd object types.
To find the units, open the object editor and then switch to "raw data" view so you can see the type identifiers. Search for the custom type "\h01" and then turn off raw data view to get its name. You can then either use the "object manager" to locate all instances of it, or you can manually find and delete them if you remember where you placed them all. To make the new type for it, simply copy and paste and in JNGP you should be given a pop-up to choose the type name for it. Choose something sensible and not-colliding. The character '@' is a good one to use since no pre-included or automatic object use it and it is supported in JASS scripts.