imreadmulti cannot read 32-bit on my computer

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I am writing a program in Ubuntu and using OpenCV (C++).

I am trying to use imreadmulti to read my image stacks, the code looks:

The 8-bit image stacks worked well, but the 32-bit did not work.

Can anyone help me to sort it out?

My project is attached, .tif file has 5 slices, but 32 bit tif file is only be identified as 1 slice.

The following link the project. https://drive.google.com/open?id=1Iso...

Many thanks,

Brian!