Sheets - Data Validation not working properly

Sheets - Data Validation not working properly

Hi there, 

I have a document with approx. varias sheets in it. The information input into 3 of these sheets is sent to its respective Pivot Table. Another Sheet has 3 columns set up with Data Validation pulling the information from the pivot tables. 

1 of these Columns with Data Validation works with no problem and automatically updates as things are changed in the data input sheet. The other 2 however are automatically updating when new information is input (anymore - they have been working fine for several months). I now have to manually select the cell with the data validation rule and press enter to get it to update which of course with a sheet with hundreds of products is impractical and makes the sheet useless to me. 

After re-entering all of the Data Validation rules etc and checking everything I can think of I just do not understand why it's not working. To be sure there is no issue with my formulas I have downloaded the file and uploaded it in Google Sheets and validation rules work with no issue across all sheets and columns. 

So, it there an issue with Zoho Sheets? Is there anything you can recommend for me to try?