Store zero data values

Hi everyone,
I recently updated sequentially my instance of DHIS2 2.29 to version 2.35.2. and it looks like everything is working fine, except when we want to visualize the data, the zero data value is not shown (simply appears blank). All data elements have already been configured to store zero data value as you can see below.

NOTE: in version 2.29 i was able to see the zero value entered
Does anyone have an idea of how to overcome this issue?