I have a similar problem. Airdroid is displaying the device memory as both the device and SD card memories. I have a Kingston 64 GB micro SD card installed with 58.42 GB total space and 23.44 GB available space, as of this screenshot.
BTW, you have a terrific app. I use Airdroid all the time.
BTW, you have a terrific app. I use Airdroid all the time.