Please Help me Firefox-Explorer differences on Categories.

[Arquetipo]

Hello

If you take a look at my store you will see that on firefox different subcategories go side by side in a row (just how i want them) but on explorer the divs pile up on a single column.

How can I correct this?

Please Help!
Thank you.
Jacobo

[Arquetipo]

i solved the problem, it had to do with width 50% had to put it to 49%

Thanks