Info about education, work, and other activities Section

I can't even with IRCC anymore. My visitor visa is expiring in 6 months and I need to renew it to keep visiting my family. I can't seem to get past this one section in the application. I've tried literally every possible permutation and combination of overlapping, non-overlapping, ascending, descending, and everything in between but it just keeps throwing up an error message.

Has anyone faced this issue? How did yall get it to work? I'd really appreciate any help I can get in this regard. TIA!