Joined datasets not showing

Left Joined three datasets and information is not showing information
When I do a table preview I see all the tables from the other datasets
Why is the data columns from the other datasets showing blank?
as shown below.

@Alexis_Parson It’s possible that there are some data where the left joined table doesn’t have values that are part of the preview.

Try changing a join type to inner/right, Check if that shows the expected value or not. If not, you might have a problem in the column you choose for joining them, e.g. string vs. integer or something like that…