Hello,
Suspending and unsuspending flashcards doesn’t affect your scheduling or settings at all. What might be happening is that the cards you unsuspended aren’t actually new and already have some scheduling history. If you are certain they are new and you’re seeing an interval of 8 days, this could just be due to the algorithm’s optimization.
If your retention rate is where you want it to be (for example, mine is 90%), you can just keep trusting the algorithm.
Here are some FAQs about FSRS: Anki FAQ: Frequently asked questions about FSRS
Let me know if you need help with anything else! 