autoload breaking ajax json response

If you look at the files there will be weird characters at the beginning of the file, like hex code.

At the beginning of the HTML page.

BOM:

FEFE 2D30 2D63 2D53 2D4D 0021 ("Big edian")
FFFE 302D 632D 532D 4D2D 2100 ("Little edian")

What did you Try? What did you Get? What did you Expect?

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