Hi,
when applying a number filter (e.g. duration or total slack) and then clicking the "filter icon" in the column header again to open up the filter dialog, the filter gets reset. This does not happen when filtering text or date columns.
To reproduce go to advanced expamle (https://bryntum.com/products/gantt/examples/advanced/)
Enter e.g. 3 day duration filter
click anywhere so the filter is applied
open the filter dialog again