'&' transforms into '%2526', '=' into '%3D', '?' into '%3F'

This is the URL I'm trying to set as a navigational link:

civicrm/event/info?reset=1&id=4

when i save it and click on the newly formed menu link, i get this:

civicrm/event/info%3Freset%3D1%2526id%3D4

as you can see '&' transforms into '%2526', '=' into '%3D', '?' into '%3F'

which obviously doesn't load the proper page.

then when i go back to edit the menu URL it still says

civicrm/event/info?reset=1&id=4

in that text field. so nothing has changed except for the way the URL is presented when its clicked on?

how to fix this issue?