Overlapping of TLN - Level 2

Hello,

The attached screen shot TLN_2.jpg  shows the overlap of 2nd level of TLN in Firefox . In IE or chrome there are no overlaps.

The overlap disappears when i adjust the height from 38px to 50px in Div of the Main table ie TLN via developer tools.

I tried changing the height property in Theme for the main table as well as second level table but it deosnt reflect in Firefox.

Please let me know how can i achieve it.

Thanks,

Glory