Links to docs contain extra character - sometimes

[YummyHOF]

When clicking on link to docs I sometime get redirected to page 404.
For example, when I click on ImpAbs anti-patter link it redirects me to https://ontouml.readthedocs.io/en/latest/anti-patterns/ImpAbs/index.html4
Notice extra character "4" at the and of URL.

I even got character "â" one time, but I don't remeber the page the link reffered to.

[YummyHOF]

I found the extra "â" in RepRel link:
https://ontouml.readthedocs.io/en/latest/anti-patterns/RepRel/index.html%C3%A2