Hopefully non bearing, If they are fiberglass columns, the edge of the column could catch the edge of the header, the capital is usually fypon, and just slides up into place and gets glued and tacked so i could remain level. GSurely they can't be bearing
or the capitals would be tilted.
The front elevation looks like traditional framing, not sure, hope its a cantilevered truss. GGene, I was thinking that hopefully this is a ranch with cantilevered trusses that bear only on the house wall. If not, your concern about bearing is not only valid, but frightening.