illiachernienko Hi Ilia!
Thank you for telling us about this. Inkscape usually causes problems when uploading to Iconfinder. It is because of its export settings or the way the icons are built there - we don't know for sure.
From what you're describing, it seems some icons might have image data. This means parts of the icon are not vector.
This tool can help you clean up image data from the SVGs: https://jakearchibald.github.io/svgomg/
We have this troubleshooting article that can help: https://support.iconfinder.com/en/articles/18153-what-to-do-when-your-icons-are-not-uploading
If none of this works, we can take a look at your SVG files 😊
Welcome to Iconfinder!
PS: Thank you so much, Laura, for jumping in to help here 😍