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CHObfusScamble.class.php
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// scramble characters
$str=$se->get();
$rstr=preg_replace("/(.)(.)(.)(.)(.)/u","$5$4$3$2$1",$str);
$qstr=CStrQuote::make($rstr);
$code=str_replace("%qstr%",$qstr,$code);
$se->set($code);
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The following line was the cause of the problem:

[BEFORE]
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$rstr=preg_replace("/(.)(.)(.)(.)(.)/u","$5$4$3$2$1",$str);
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This will fix the issue

[AFTER]
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$rstr=preg_replace("/(.)(.)(.)(.)(.)/",'$5$4$3$2$1',$str);
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