i downloaded a file from vecteezy.com , open it up in inkscape , they are splatters , but they seem to be like closed in a group , i tried ungrouping a splatter ,but when i move it , because i try to put it in my canvas , when it moves out of the big group it gets like overlaped by the background .is like if there is a invisible alpha channel that dont let see thrue.

Any ideas ? heres a video showing what i do : http://www.vimeo.com/873231

Are you sure those splatters are not in a clip? What does the notification region of the status bar tell you when you have the entire set of splatters selected? It should give you hints about the object you are working with. If it's a clip, you should be able to release it.

If you still can't figure it out, provide a link to the file.