UBB.threads PHP Forum Software Community Forums UBB.threads Bug Reports url encoding of "." (without quotes)

I'me running 7.5.8. When users are making a topic and referring to a external link ending wit: .
Ubb is truncating this url without a . which is a non exsisting page.

For example the url
http://wiki.aquacomp.nl/index.php?title=Kakus_laten_herkennen. (the existing page)
will be truncated to:
http://wiki.aquacomp.nl/index.php?title=Kakus_laten_herkennen (which is a non exitsing page)

Try this
Is this a bug in UBB, or Apache or something else?
Running on Ubuntu 12.04