Quick Question

Hey there. I just discovered this site last night and joined to help spread my torrents a little further than normal. Some of you may have seen me on other torrent sites (same name) and I only up good and tested (by myself) files. Now after I joined here, I went to up a few of my latest torrents and I always do a search beforehand because there's no need to keep uploading the exact same thing. All my torrents are already here it seems. My guess is that this place has spidered the other sites I belong to and imported them because when I looked for uploader info there is none. Is that correct? Also, my ip is dynamic and it doesn't change very often but it does change (I haven't kept track of how often but I'd guess maybe a few times a year) so should I be contacting staff about that or did they just mean constantly changing ip's? Thanks in advance.