slicer not changing card visual

Dear community,

I have a data model with 3 tables as follows. 

I have a slicer with from the table on the left with the field"table 1 country" and a visualisation that uses "count of procurement assigned category" from the table in the top right of the model. When i filter the table 1 country slicer, the card visualisation does not change at all. I have no idea why this is happening. I did merge table 1 to the data table on the left to get the field "table 1 country" could this have an effect?

Can anyone offer any advice?

thanks a lot