Please Read - To check the dates, please use shorter date ranges of 3 years or less. Example, if you have been attending training since 2001 to 2010, input dates in groups of 3 years or so. 2001-2003 , 2003-2005, 2005-2008 etc.
This is a limitation at the moment on the site in displaying large date ranges which will be fixed in the near future.