I am using custom filters on a SharePoint sub site list and depending on the laptop connecting to the SharePoint site the custom filter is not visable (only the data in the column is seen as filters when the custom filter is missing). This is an issue because the client using the site wants to sort the data by ranges equal to, greater than and so on which are only available if the custom filter in the drop down menu is there. I have included a screencap of what it looks like when it is working. Again, when it is not, the custom filter does not appear. Also, again, this occurs for the same user depending on laptop. I have checked the internet security settings and they are the same on a lpatop which works and one that doesn't (I have also tested on an IE8 and IE9 to see if a different version would cause the issue with custom filters but both versions caused no issues).
At this point I am not sure where to look as the user is the same, the version of IE doesn't seem to affect the custom filter and the IE security settings under internet are the same. Any help in other places to look or users who have had simular issues would be appreciated.