Yeah, congrats, I’ve had this exact problem and it appears by design.
I did an in depth analysis here.
In addition to the models failing to seat properly, the other issue is the construction materials. I found the assembly screws to be very soft and easy to strip. At beat you could assemble/remove those connectors two or three times before the screw heads stripped. I was really so not impressed by this brand at all.
But basically I suggest you give up on Wattgate and get another brand, preferably something without rhodium plating, but the Connex models aren’t bad.