Every time I press the Compile button in the editor, I have to rebuild the project

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1

Before I open the editor, if I open the UE4Editor.modules file it will have:

"Modules" : 
{
	"ProjectName" : "UE4Editor-ProjectName.dll"
}

after I press the compile button, it will change to

"Modules" : 
{
	"ProjectName" : "UE4Editor-ProjectName-5920.dll"
}

or some other number appended to the end. There is no corresponding dll, so when I open the uproject again, it will say that a dll is missing and I need to rebuild. Once I rebuild, the module returns to the original file.

Any idea what’s going on?