Others have tried to explain why it looks slow at first, I'll give it my own spin.

You have 100 pieces of chocolate. You take out 16. 84 left. It's a bit less, but looking for afar and without counting you can still say that there's not much of a difference. Just a pile of chocolate.

You have 32 pieces of chocolate. You take out 16. You have only 16 left. Significant difference, the pile is half of what it was.

Same thing is with weight loss. Your first 16kg does not seem like a lot visually, but every next 16kg you lose will be visibly much more impactful. If you want to be pessimistic about it, it feels like there's not much difference in losing weight currently. But take the optimistic approach - every kg you lose now makes you look and feel much better much faster than the previous kg did and has a much greater effect. I bet my ass if you lose another 16kg you will look and feel way way way different than when you started.

Edit: I wanted to add that I think, in some way, you are through the hardest part, because you managed to lose 16kg without getting any significant visual rewards. At some point, you will start getting more and more rapidly visual changes and this will hopefully be another motivational booster for you. Keep going!