Hi @jan_mac,
Could you please tell me how you configure your data and your Checkbox?
Do you want to update all the three column with the Checkbox text?
Based on your description, if you want to update each column with different status value, you should insert 6 Checkboxes within a single section of the Gallery. Each column should have two separated Checboxes to select the status value.
I have a simple test for you, please check as below.
1). Insert 6 Checkboxes into the Gallery as below, set the Text of the separeted Checkbox the red lined input.

2). Set the following properties of the Completed Checkbox corresponding to 'Agile Foundations' as below:
OnCheck:
Patch(Tab2,ThisItem,{'Agile Foundations':Checkbox3.Text})
OnUncheck
Patch(Tab2,ThisItem,{'Agile Foundations':""})
Default:
If(ThisItem.'Agile Foundations'=Checkbox3.Text,true,false)
Please repeat this for the following 'Srum Master Training', and 'Product Owner Training' column.
3). Set the following properties of the Not Started Checkbox corresponding to 'Agile Foundations' as below:
OnCheck:
Patch(Tab2,ThisItem,{'Agile Foundations':Checkbox4.Text})
OnUncheck:
Patch(Tab2,ThisItem,{'Agile Foundations':""})
Default:
If(ThisItem.'Agile Foundations'=Checkbox4.Text,true,false)
Please repeat this for the following 'Srum Master Training', and 'Product Owner Training' column.
