The problem occurs in both cases, when importing from "import development profiles and presets" and in the presets by clicking on "import presets". I also tried to manually insert them in the destination folders but nothing.
All Presets are stored in 2 different locations which can be viewed in the File Manager for the OS your are using through the LrC Preferences on the "Presets" Tab. The Develop Presets and then All Other Lr Presets.
Also you used the word Profiles. Those are completely different from Presets.
What exactly are you asking about? Presets or Profiles?