I have done investigation into this issue. This problem I get only when I use IE 7 browser.
My clients are using IE7 browser. So, Please test this bug by setting your browser mode to IE 7.
Please find the attached screenshot and sample project which replicates our exact issue.
We have updated our DLL to your latest version of Aspose.Cells.GridWeb.dll (220.127.116.110) and tried. but the issue still exist.
Issue: When the aspose gridweb is in editable mode and having many columns. When you scroll to the right side of the grid and selects any cell to edit, The cell is moved to the end of the grid. This behaviour of the grid confusing our client as the selected cell is jumping arround.
Have A Good Day!