Border Collapse differences in FF and Webkit

Question

I have a table with the following rules :

    <table cellspacing="0" cellpadding="0" style="table-layout:fixed;
width:1000px;border-collapse:collapse;border-spacing:0">

and the cells have the following CSS:

td{
padding:4px;
height:22px;
border:1px solid gray;
}

The computed style for my table cells looks like the following in FF:

padding-top 4px
padding-right   4px
padding-bottom  4px
padding-left    4px
border-top-width    0
border-right-width  1px
border-bottom-width 1px
border-left-width   0

whereas on webkit, it looks like this:

padding-bottom: 4px;
padding-left: 4px;
padding-right: 4px;
padding-top: 4px;
border-bottom-width: 1px;
border-left-width: 1px;
border-right-width: 1px;
border-top-width: 1px;

For some reason, there is a difference in the following two properties:

border-top-width
border-left-width

Is this a known issue ? Any possible solutions to the problem ??