Categories are not showing

Hello, I have the following problem:
I loged to my web site, and my cart (module) had a couple of items in it. I tried to add new items to the cart (the cart was updated) and clicked on "continue to checkout" in a popup window. Then, i was redirected to a main category page (root), with the description text, but with no visible categories. It happenes all the time.

Another problem i have:
I configured 2 delivery methods: self pickup and a delivery (min. of 150$). i was testing the store, and i saw that sometimes, only "self pickup" displayed, although the payment amount was more than 150$.

Pardon for my English and i hope that you could help me

You seem to have some caching issues. Make sure that the joomla cache in the configuration is disabled and that the joomla cache plugin is disabled in the plugins manager and try again.

That should hopefully help solve both problems.