I installed your plugin and as you wrote it did update the number of likes after about an hour, but it did not get everything right. I waited more but it did not fix the error.
Please take a look at this screenshot:
It gets this page right:
http://www.dawnotemuwkrakowie.pl/miniatury/ (578 likes)
But it shows 0 for this one:
While it has 145.
Do you know what could cause this issue?