Zoho Sheets Filter Issues

Zoho Sheets Filter Issues

I appear to be having ongoing issues with my filtering in zoho sheets. 

Occassionally random cells will not filter in accordance with the rest of the sheet. 

Usually I filter by time, and then date - this allows the full sheet to order by correct date & time, however occasionally this does not work and the fields don't match the correct order. 

Would love to know if there is a formatting issue I am doing!