https://sh.wikipedia.org/w/index.php?title=%C5%A0ablon%3ARefbegin&veaction=editsource
ends with
column-width: {{{colwidth|30em}}} }} }}">-{</includeonly>which puts an unbalanced -{ in the wikitext. This is matched by }- in [[Template:refend]] presumably.
This leads to visible artifacts in the output, eg in https://sh.wikipedia.org/wiki/Mary%20Wollstonecraft%20Shelley?useparsoid=1&variant=sh-cyrl we see:
