"x%x%" is rendered as "&" in Textile formatter
The character sequence described in the subject is always rendered as "&" in Textile formatter. You can easily reproduce this issue by entering the sequence in a description field of an issue.
You see '
=> "&"' in the second line of the following text. Actually, it is 'x % x %" (I cannot spell it without spaces due to the bug).
2.3.3 :001 > ['x', '%', 'x', '%'].join => "&"
#1 Updated by Go MAEDA almost 4 years ago
This is because RedCloth temporarily replaces "&" with "x % x %" (actually, there are no space characters) while converting Textile to HTML.