Thanks for replies.
I've already tried scaling - with no results.
I am uploading a .skp file with the model before and after using RC. Now I feel like it's even worse. I usually edit these errors manually, but it takes a lot of time.

FRC.skp

Hello,
Round Corner loses some of the model's surface and I can't seem to fix it, although I have tried changing various settings.
Are there any settings or rules in Fredo Round Corner that I don't know about?
Please help me solve the problem.
I'm attaching an image.

01FRC.pdf