Mine are similar to yours, but only two relatively short periods per year. It hits me mid-spring, and end of summer.

As for your allergy testing, it’s likely you’re not really allergic to all of the allergens you were tested for. In many cases for those tests, if a few of the allergens trigger a reaction, then all or most of the injection sites will react rather than just the ones you’re allergic to. It helps when you can tell in the moment which one started it, since reactions happen quite quickly.