Measures not working when using live connection

It's my first time to use the live connection in Power BI.

Before publishing my pbix file, all measures are working fine. 

But when I connect to that data model using the Power BI services, some measures yield blank values, which should not be the case.

And when I go to my source data model, some measures are also broken.

Can anybody help me with this issue? Thank you in advance!