It sounds like the holes were not cleaned properly. For people inexperienced with bolting, it is important with all bolts, but especially with glue-ins to clean the holes very well so the glue can seep into the pores of the rock. I use both a blow bulb and tube brush alternating several times at least until nothing comes out. When shooting the glue in one needs to start with the tip of the nozzle all the way in the back and slowly draw it out as you pump so as not to leave air pockets. Experience will tell you how much to put in to not waste too much, but over fill rather than under. It should squeeze out as you twist the bolt in. You then neaten it up with your finger, making sure there are no air pockets or gaps at the surface level for water to collect in. With a new nozzle you also want to prepump some glue through into a rag or something to make sure the glue is mixing properly before shooting it into the hole. Those galvanized bolts should be countersunk a little. The Wave and Bolt Products ones are not countersunk (maybe just a tiny bit for aesthetics, but that makes it harder to cut them off and core drill if they get damaged and have to be replaced) The Wave and Bolt Products glue-ins are designed to have a little spring action against the sides of the hole to keep them from sliding out of overhangs while the glue is drying so they need to be tapped in with a hammer during the last part of the insertion. Ideally the hammer should be SS also or a wood, rubber or plastic mallet to not introduce carbon into the surface of the bolt (according to the manufacturer) The Wave bolt manufacturers actually have a handy SS tool that fits over the bolt for this purpose which also helps maintain the shape of the bolt eye as it is hammered in.