A line graph shows a straight line when using two slicers

[Nara]

Please help!

hello, I am very new to this. I have created a line graph showing the use of transportation in different countries and want to use two slicers to filter the graph (both from the same data source). One slicer is a list of countries, the other one is transportation type. however, when I select one item from each slicer the graph shows a horizontal line, which is wrong. The graph works fine when I select one item from one slicer and select all items in another. My values are SMA.

[Nara]

@Greg_Deckler Hi Greg! Thank you for replying. 

So this is my table, the "Custom" column is my Value. 

Both sample data (transportation type and conutries) are text. I want to create to slicers (list of countries and list of transport types). My axis for the line graph is Date. But choosing one item from each slicer (e.g. Brazil and walking) gives me a straight horizontal line. The graph seems to work when I choose all countires and one tranport type, and vice versa (one country and all transport types).

Hope this was a clearer explanation.

Thank you!!!

[Greg_Deckler]

@Nara Sorry, having trouble following, can you post sample data as text and expected output?
Not really enough information to go on, please first check if your issue is a common issue listed here: https://community.powerbi.com/t5/Community-Blog/Before-You-Post-Read-This/ba-p/1116882

Also, please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.