The following occurs on my activity page:
The question it links to is Is there an explicit expression for Chebyshev polynomials modulo $x^r-1$? and it seems that the MathJax in the end somehow got superimposed at the beginning of the link text.
This happens on Windows 10, Chrome 76.0.3809.132 (64-bit)
Don't know if this might be useful for anything but when I right-click on the link that superimposed thing disappears.
Maybe I should add this issue to the List of recurrent technical problems involving MathJax but it seems not to satisfy conditions given there.