Thanks very much for reporting this Artur, but I can't seem to be able to reproduce the issue. Which browser are you using?
nostr:npub16c0nh3dnadzqpm76uctf5hqhe2lny344zsmpm6feee9p5rdxaa9q586nvr nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg Primal Web doesn't show my like when I click on the heart, have just send 6 likes in a row by retrying. They only show up after reload.
Discussion
I Had the same problem with Chrome