Edge Explore only retaining last TCX map uploaded

My Edge Explore running software version 4.40 is having issues uploading new maps from RidewithGPS. I am running a PC with Windows 10. I have two courses that I want to upload with similar names. They are differentiated by the miles. I can upload the first one but when I go to upload the second one it eliminates the first and only retains the most recent uploaded in courses. I tried changing the file name thinking that there wasn't enough differentiation but that didn't solve it. Why am I no longer able to upload more than one map? I had no problem doing so in the past.