The small taper seal is breaking, whether it's because of angle, not enough surface, the tooth washer and spring preventing the taper from engaging, the design and individual parts have its unique quirks. For me it was threading it on firmly, then get final two clicks followed by a wrist snap motion for one mount and a thread on firmly, don't try for the extra 2 clicks but just wrist snap it. (I've since switched to another system)
The design also doesn't seem to utilize the taper was the primary friction locking surface and its use seems more like it's to deal carbon from getting into the threads. You can do this experiment, remove the spring and teeth washer from the mount, thread on the suppressor, give it a snap and see if it locks the way another taper system would. It doesn't, not in my experience. However, could've been an out of spec mount, not sure.
Compare it to a simple Plan A, Plan B, Atlas, Xeno, the new YHM SRX, etc where the larger taper surface combined with threads creates the friction lock when it's threaded on firmly without some external factor that could prevent a user from mating the surfaces of the taper together consistently.