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When viewing the Wikipedia article https://en.wikipedia.org/wiki/Arithmetic_group in the iOS Wikipedia app, there is displayed just above the section heading "S-arithmetic groups" a string that reads (as a top level heading): '''`UNIQ--postMath-00000068-QINU`'''-arithmetic groups The source for the heading is == <math>S</math>-arithmetic groups == I presume this is some sort of error message. The problem is fully reproducible on my device. I am using an iPhone X running iOS 11.3 and there are no pending updates. The problem does not occur when viewing the same article in Safari on my iPhone nor in Safari on my MacBook.