Align problem objet 3d

Hi ! I have a problem for a moment that I can not solve, in the editor on ue4, wanting to precisely place my object, it refocuses automatically, as on an invisible grid I’m already looking on the Internet but I do not know what it would be: /

you can disable grid placement in top right corner as shown on the picture. The left arrow is the grid placement you want to disable

It is already disabled ! :slight_smile: that’s why I do not understand … I also try pressing “END” but it does not change anything