File contents keep being replaced with other file.

[Bernadette]

This is very strange. I've been trying on and off for two days to copy two sets of sermons to my micro sd card: Romans10Seventeen, and the last archive from AudioSancto. Every time I try to copy the AudioSancto files, they're replaced inside the folder with the Romans10Seventeen files. The files show up fine on my computer's hard drive, but when I go to copy them to the micro sd card, they're replaced by the other ones. I can't figure it out. Anyone?