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Need some time to detect all files. Look in storage sense after a while
Did you try rebooting your phone? I know it sounds silly. But if it still won't work, try a soft reset.
How did you transfer everything? I mean you transferred it using a card reader or by usb?
When you started transferring your data on SD card were there any folders? Default folders like music pictures videos?
I also have a SanDisk 32gb class 10 ultra SD card I was also having this issue but later on I formated my SD card and copy all the data again and the issue was solved
Try other memory card if it works fine then something is wrong with your memory card.
By card reader or from the phone ?
I formatted the card from phone two times but it didn't solve !!