It’s really disappointing finding such an error after the activation. You told me it was a long drive and a long hike of nearly 3 hours with the always attractive incentive of a 1st activation, but I’m confident that you will soon gather the will and energy to go back there again and carry out a successful 1st activation of EA1/LE-122.
You reached the actual summit, but due to your wrong GPS waypoint, you kept going, descended about 50m and ascended again to a wrong nearby summit. The good thing is you now know your total ascent time and effort won’t be that much, as you won’t have to do that final descend+ascent when you go back to activate the good one.
Take care and don’t worry too much. Many of us have made such errors. Admitting this one of yours has been a honest move from you