panel flexible

When i try to put 100% width to any column of a panel pages, they put aways something near 99, 99.5, 99.9.
Anybody knows why and where can i go to change this?

I think that are happen because some wrong calculation inside module.

Some time this can appear insignificant but are making all my layout crash.

Wrong Generated CSS:

div.panel-flexible div.panel-row-1 div.panel-col-1 { width: 99%; }

So.. i have tried override css tag but the generated css are put inside the main layout file. So, i cant do this.(i think)

ty in advance