Strange behaviour on importing tables

I have 556 tables in database and I exported the whole database from my web server and imported to empty database but only 540 tables were imported. How is it possible? There must be something with foreign keys, but what? And why HeidiSQL doesn't report anything?

When exporting, you need to check the result list, which shows rows and duration. Errors are red, and probably you have some tables which make problems here, or views.

I'm doing it the same way almost one year but I always check the number od tables after import. Till yesterday it was working well, now not anymore. Strange. I'll do some more checks.