Hi @franclin_foping,
You are correct that our site was designed by your resellers - that was 2 years ago now. As an end user I have to make an educated guess with regard to the cause of an issue so sometimes I may get that wrong - apologies. However it was definitely previously working fine so its a bit odd!
With regard to the Facebook Share button not appearing when you change matrix items, that is still an issue for us. I followed the instructions in this post Change Facebook 'Like' to 'Share' to put that button in. At the time I found the same error in the flowsurfandskate implentation (who raised the post) which is why I looked to you for help. Can you shed any light on that at all?
Thanks,
Emma