Hi, first please update your Toolset and WPML plugins to the latest versions. Temporarily deactivate all plugins except Types and Views, activate the default Twenty Seventeen theme, then test the Slider again. Is the pagination showing now?
If yes, please reactivate your theme and other plugins one by one until the problem returns.
If no, please copy filter code from the Search and Pagination panel in the View editor screen. Paste it in your next reply so I can review everything.
sorry to bother you, I just tried to remove the filter query and the pagination still does not show. There are 4 post which match the query. I also tried some other things but can't find the solution.