The 38 Special can be a strange cartridge. Powder selection is important.
At least one ammunition company I aware of will conduct special tests with the 38 Special when looking at new powders. The test consists of firing the test rounds straight down, putting the powder charge against the bullet.
This is a worst-case situation and if there is going to be a BIB (bullet in bore) type of squib, it will normally happen with this test. Powders that pass the test will be used in production ammunition.
Other companies may not conduct such trials and use powders capable of giving problems. Recoil of preceding rounds fired (particularly) in a revolver may leave the powder charge next to the bullet, possibly presenting a problem situation.
The problems described with the Armscor ammunition make me think this may be a factor. Thereby, it may not be that they were faulty in loading the ammunition, simply that they are using an unsuitable powder.
Any time there is a problem with ammunition, get with the manufacturer. They want to know about it and try to determine the cause. It does them no good to not try to fix problems, and they want customers to be happy with their products.