Have you solved your problem with the solution provided by @MFelix?
If you have solved, please always accept the replies making sense as solution to your question so that people who may have the same question can get the solution directly.
If you still have this issue, we should try something below.
1. Please check your data type and refer to the screenshots @MFelix provided.
2. You could create a simple data source with the number 1,2,3......, then test it if you have the Betweem Slicer?
3. If it is convenient, could you share a dummy pbix file which can reproduce the scenario, so that we can help further investigate on it? You can upload it to OneDrive or Dropbox and post the link here. Do mask sensitive data before uploading.)
Community Support Team _ Cherry Gao If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.