After a campaign has ended, it’s not uncommon for some pledges to drop. In these cases, we do reach out to backers with reminders to correct their pledges. If a backer doesn’t resolve their payment issues within seven days from your project's deadline, their pledge is dropped. This means that they will not be able to update their payment and are no longer considered a backer of the project on Kickstarter. There is no way to extend this timeframe to fix a pledge, nor is there a way for a backer to support the project through Kickstarter after the seven days. You can read more about this here.
Creators will still receive the balance of collected funds, less fees, even if you fall below your project's funding goal due to dropped backers. Your project page will not be updated to reflect dropped backers or pledges, but you will have access to this information in your Backer Report. Note that, in accordance with our Terms of Use, creators will still be liable for completing their project and fulfilling rewards.
If the amount of funds that you receive is significantly less than your funding goal due to dropped pledges, you may want to consider refunding your backers and relaunching your campaign.
Please note: Kickstarter will only collect fees on funds that are successfully collected.