since error is during refresh in online

We are currently facing an issue during dataset refresh in Power BI Service. Although the refresh is completing successfully, multiple warnings related to column sorting are appearing.

This issue was not occurring earlier, and the dashboard was refreshing without any warnings.

Could you please help us understand the root cause and how to resolve it?

Refresh completed with warnings.

• Column reference to '<oii>monthEnd</oii>' in table '<oii>MTBF_emergency-data</oii>' cannot be used with a variation '<oii>Date</oii>' because it does not have any.
• Cannot order '<oii>Table (12304)</oii>'[<oii>Column (3133138)</oii>] by [<oii>Column (3071437)</oii>] because at least one value in [<oii>Column (3133138)</oii>] has multiple distinct values in [<oii>Column (3071437)</oii>]. For example, you can sort [City] by [Region] because there is only one region for each city, but you cannot sort [Region] by [City] because there are multiple cities for each region.
• Cannot order '<oii>Table (12304)</oii>'[<oii>Column (3262554)</oii>] by [<oii>Date (12354)</oii>] because at least one value in [<oii>Column (3262554)</oii>] has multiple distinct values in [<oii>Date (12354)</oii>]. For example, you can sort [City] by [Region] because there is only one region for each city, but you cannot sort [Region] by [City] because there are multiple cities for each region.
• Cannot order '<oii>Table (3496803)</oii>'[<oii>date day (3497565)</oii>] by [<oii>Date (3497539)</oii>] because at least one value in [<oii>date day (3497565)</oii>] has multiple distinct values in [<oii>Date (3497539)</oii>]. For example, you can sort [City] by [Region] because there is only one region for each city, but you cannot sort [Region] by [City] because there are multiple cities for each region.
• Cannot order '<oii>Table (3786608)</oii>'[<oii>week start mmdd (3787716)</oii>] by [<oii>week start (3787710)</oii>] because at least one value in [<oii>week start mmdd (3787716)</oii>] has multiple distinct values in [<oii>week start (3787710)</oii>]. For example, you can sort [City] by [Region] because there is only one region for each city, but you cannot sort [Region] by [City] because there are multiple cities for each region.
• Cannot order '<oii>Table (3996874)</oii>'[<oii>date day (3998294)</oii>] by [<oii>Date (3998268)</oii>] because at least one value in [<oii>date day (3998294)</oii>] has multiple distinct values in [<oii>Date (3998268)</oii>]. For example, you can sort [City] by [Region] because there is only one region for each city, but you cannot sort [Region] by [City] because there are multiple cities for each region.
• Cannot order '<oii>incidents (3019951)</oii>'[<oii>Status (3190955)</oii>] by [<oii>status sort (3160850)</oii>] because at least one value in [<oii>Status (3190955)</oii>] has multiple distinct values in [<oii>status sort (3160850)</oii>]. For example, you can sort [City] by [Region] because there is only one region for each city, but you cannot sort [Region] by [City] because there are multiple cities for each region.