The Ideas Category has topics which are older then a year ago being hidden due to a dated parameter setup which isn’t applicable to any other category. Note the - Year Jul 3,2017 - Jul3, 2018
Not applicable to either the bugs or releases categories
Whilst, one can click on the right side down arrow to get other date options it is not a natural action for users to take so therefore topics older then the current past year aren’t being viewed.