Search facets numbers background are displayed elongated downwards when the filter name is on two lines

Steps to reproduce

1. Go to the search page
2. Search for a word, e.g. "wiki"
3. From "Filter your search" facets, expand a filter that has a custom date interval, like "Creation date"
4. Click on "Custom date & time interval" (or select its checkbox)
5. Input a start date and an end date
6. Click "Apply" button
7. Observe the shape of the result number background in the right of the filter

Expected results

The shape of the result number background is round (or almost round).

Actual results

The background shape is elongated downwards (this is observed in this case since the date/time filter is displayed on two lines).