PS3 Level 2 menu text partly hidden by Level 1 menu

I have a problem in that the text in level 2 (L2) items in my menu is partly covered by the width of the level 1 (L1) menu.

I thought at first that this was a problem caused by me customising the menus supplied in PS3 (using CSSMW). The changes I made being to the menu’s colours and the width of the main menu to 110px and L1 & L2 to 125px; nothing dramatic. However, I did have this overlap problem.

The cause of this seems to be L1 Sub Item 1 is narrower than L1 Sub Item 2. This means all Sub Items (2, 3, etc.) in L1 partly cover the text in L2’s Sub Item 2 and onwards.

Just to see if it was me or not, I opened the original PS3 menu I have on my check site and found this problem was already there to start with and my alterations hadn’t caused this error. As a picture saves a thousand words, I have attached screenshots of the original PS3 menu both in CCSMW and in IE8 to show this point.

I would really appreciate someone helping with this, as I need to solve this problem ASAP. Thanks in advance for any help.