After site migration from sp 2007 to sp2010, in one of the custom list the lookup drown getting freezed at one postion even if i click on the 2nd dropwon the values are showing at the previuos postion

Hi Techies,

We have mirgated the site from SP 2007 to SP 2010. After this in one of the custom list there are 3 lookup columns which are coming as dropdown in the add new item form (as shown below). When i click on the first dropdown the values are coming fine exactly below the dropdown but when i click on the 2nd dropdown the values are coming on the previous 1st dropwdown postion only (the box is getting freezed. This is not happening in Goolge chrome.

Please help me to resolve this issues

Regards,
Santosh