Using the Facebook URL Debugger, I was able to see 39 Like's on your home page when using http (no SSL):
developers.facebook.com/tools/debug/shar...ww.tz-krk.hr%2Fhr%2F
However, after reloading the page once, your page was re-scraped by Facebook and the newest Open Graph tags were detected on your page, which indicated to Facebook that https should be used.
I'd recommend either:
* Setting the force SSL setting to 'http' so that Facebook will think all pages of your site should be links to http. Your site will automatically redirect users to the https version
* If it's just your homepage that you want to keep the Like count from, add the following tag *just to your home page*:
{SCOpenGraph url=http://www.tz-krk.hr/hr/}
That will tell Facebook that Likes for your home page should use http, but let all other pages start getting their counts with https.
After you make any changes, use the Debug Tool above to re-scrape your page and then verify things are working. If you don't re-scrape, then the count won't update until Facebook re-scans the page on their own.
I hope that helps explain,
Alex