If some strings do fishy things (like overwriting existing output, messing up your console etc.), a good way to debug that is this:

use Data::Dumper;
$Data::Dumper::Useqq = 1;
print Dumper $yourstring;
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This will probably reveal a \r, which is a carriage return, which causes the console to go back to the start of the line, overwriting existing output.