Steps to Reproduce:
Go to https://en.wikipedia.org/wiki/User:Jonesey95/sandbox21
Use LintHint to view Linter errors, or just view the wikitext with a syntax highlighter enabled. The page has 49 Linter missing end tag errors. This count can be verified by viewing the wikitext in the section below "The following players took part in the tournament:", where dozens of instances of italic markup are unclosed.
Go to Page information. Observe that under the Lint errors section, the page is listed as having just 1 missing end tag error.
This discrepancy is not fixable via a purge or a null edit.
Page information should show a count of 49 missing end tag errors.
This miscount is preventing the original page (https://en.wikipedia.org/wiki/2014_Austrian_Darts_Open) and many other pages from being listed on the Special:Linterrors pages and on https://en.wikipedia.org/wiki/User:Galobot/report/Articles_by_Lint_Errors which is a report of the top 1,000 mainspace pages by error count.
2014_Austrian_Darts_Open is not the only page with this problem. At this writing, the problem is also affecting 2013 UK Masters, 2014 Dutch Darts Masters, and 2014 European Darts Grand Prix.