This issue came from an extra line in fslinfo outputs.
The file name, or the directory name, including 'min' standing for minute, made difference in NIFTI filename filter (https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind1705&L=FSL&P=R40042&1=FSL&9=A&I=-3&J=on&X=BAD60F30B5A0850A6E&Y=jianhanz%40usc.edu&d=No+Match%3BMatch%3BMatches&z=4).
fslinfo added 'filename' as the 1st row into the dummyinfo.txt. The value on 'data_type" was passed to 'xLen', and was 'NaN' in the features.csv.
By removing the 'min', the Parameters were retrieved correctly, and so as values in several columns (No. 23, 29, 30, 36, 37, 68).
Although this solution may be strange, 'min' may be involved in default setting in fslinfo or FSL.
Thanks Sourena!
Jianhang Zhou
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