Range filter not working

[dathwa]

Hello.
The range filter does not seem to be working properly.
See the demo: https://mall.offline.swiss/en/category/bikes/mountainbikes
See 18 bikes.
Shift the "Fork Travel" range from 160 to about 155. Bikes disappear.
Shift the "Fork Travel" range back to 160. Still only 6 bikes.
Only resetting the filter brings all 18 back.

Thanks