contribution of seal stone

if i contriibute my seal stones to dawn and i lose, will i loss all my seal stones?

Nope. You just can't recover them until dawn wins (and you're signed up dawn).

can you contribute stones to dusk, dusk lose, you go dawn for a few cycles, and one year later you're in dusk and dusk wins, then will you recover them?:)

Yes.

can you contribute stones to dusk, dusk lose, you go dawn for a few cycles, and one year later you're in dusk and dusk wins, then will you recover them?:)

I've done it. ;)