Zabbix 3.4.14

We have around 300 hosts linked to the same template.

Template is called "Managed switch 26 ports" and includes items to collect interface statistics.

Problem:

Steps that caused this problem:

1. Open template items
2. Mass select all items
3. Click 'Mass update'
4. Select 'units' and type in 'bps'

5. Select 'preprocessing steps':

6. Click 'Update'

All hosts within this template will suffer from some calculation issue and the result is on the graph above.