Because you keep using the Resume & Find Sources functions. Whilst these can be successful, they are definitely not the best way to continue downlds. What's more, if you use it on too many files you'll find your files queue for much much longer than normal. Another side effect is that it can use up much/most of LW's & your system's resources & slow down both LW & your computer. These functions only seek out immediate sources.
It is much more effective to manually search for sources & fresh sources for your incomplete files. The manual search is much moe comprehensive than the latter (resume & find sources.) What's moe, if you're uplding to others it can help to improve your search & dwnlding results. This makes it easier to find more sources & get connected easier.
Here's some hints: A well set-up LW can start to automatically continue its dwnlding after it's settled down perhaps 2 out of 3 times you open LW.
Optimising LW & Maximising Uplds & Dwnlds A (1st post only) & also
Part B which is even better & last & least are
search & dwnld hints. The latter one I've been thinking about re-writing for some time. That's just for playing it safe. eg- I show all speeds & qualities.