Problems adding new sprints with begin date bigger/or the same as last sprint

Im unable to add new sprints
with begin date bigger than last sprint created.

This works fine for another project
Say for example I want

          day/monty/year
sprint 1 - 01/01/2014 -> 02/01/2014
sprint 2 - 02/01/2014 -> 03/01/2014

so far works, but trying to add this:

sprint 3 - 03/01/2014 - 04/01/2014

Fails because I cannot select the 03/01/2014 as begin date.