That means you're in a queue with them. As suggested, you're swapping uplding positions to them with others also. This sometimes happens. It's just how it is & there's not much you can do except search for more sources so you don't have to rely on that one source with the good speeds (or not). So that means they're a popular host for files. Either that or they don't have many slots open for uploading. Well hey.. it's better that than not connecting at all.
Try re-searching the topic to see if you can find more sources!
Try broadening your search. Try an AnyType search. Try browsing those that also have the same file from your browse results on the person you're trying to get the file from, etc. Try brain-storming with other possibilities for finding other sources using an any type search. I find these are better than specific file type searches IMHO. Sometimes people misspell filenames, etc. or just rename the same content differently. Using Bitzi lookup can help to give you clues as to what other names the same file might be known under.