Menu Filter boxes position

Hello, I am having an issue with your (very good) library ! I am working with your last version (3.0.0 rc. 22) and when I want to access filter menu by clicking on the down arrow, the box is not well positioned in the grid. My grid is built with 20 visible columns and 4 are hidden. The strangest thing is the following : it only happens when my horizontal scroll-bar is in the grid second half, it works properly on the fist half... Do you have a solution to this strange issue ?

Thank you for your answers.