How tight did you put the rings on the jar before canning? It is possible to have them too tight or too loose. You want the pressure that builds in the jar to be able to sneak out around the lid gasket, while being at the same time being tight enough to hold the vacuum when the temperature lowers. With 5 of the six not sealing, and your still learning the process, I would suspect this before a bad batch of lids.
As an added note: we are starting to get limited deliveries of Ball brand bulk lids. We were also given lids to test by one of our suppliers for new manufacturer out of Ohio. Lids are being made in the USA with USA components. The parent company specializes in automotive seals and gaskets. The process of canning should inflict a whole lot less stress, temperature and chemical issues than automotive seals, So we are looking forward to testing the lids. The largest difference I have noted with the lids is the gasket material is blue, somewhat more flexible, and quite a bit thicker than the Jarden (parent company of Ball and Kerr) brand lids. The thicker gasket should allow the gasket to flex a bit more, which may give a little mroe room for error but I guess we will see.
I am guessing here, but I believe the thicker seal will allow better grasping of the jars, as well as increased reusability of the lids - not recommended, but often done in our household. One of the advertised selling points of the new lids are they were tested for resealing 10 times. Again, they are careful not to recommend the practice, but we often reuse lids for less critical products, something like applesauce, where reprocessing does not affect the consistency or quality of the product.
Note: our testing of the new lids is focused on reliability of seal consistency during vacuum packaging in a chamber vac, in particular, how to the seals hold up during the sealing of course (grains) and fine product (flour). Something like flour is often an issue where a vacuum pump tends to draw some of the powder into the seal during the air extraction process. We are running pressure canning and water bath canning tests also. We will not have enough sample lids to try dry heat oven canning this time, hopefully within the next month we will get some product from the production line.