i had the same issue when i changed from silver to gold. When i went to the lounge, i told them I'm already gold and i showed them my klm app. They checked my fb number and confirmed it, so it was all good.

I entered 3 times in different lounges having just silver on my ticket and after explaining the problem, i got in immediately. So don't worry about it, you'll get the right amount of miles and lounges should not be a problem.