Why does “find . -name *.txt | xargs du -hc” give multiple totals?

Question

I have a large set of directories for which I\'m trying to calculate the sum total size of several hundred .txt files. I tried this, which mostly works:

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Answer 1

find . -print0 -iname '*.txt' | du --files0-from=-

and if you want to have several different extensions to search for it's best to do:

find . -type f -print0 | grep -azZEi '\.(te?xt|rtf|docx?|wps)$' | du --files0-from=-