wondering -- did you ask the lender if he/she sees what changed, or was it different lenders?
If you find that you need credit repair assistance, I can give you a referral who has done well for me in the past.
best of luck to you!
We recently posted an in-depth review of credit-scores and factors on our website at http://approvedfunding.info/personal-finance/fico-improve-cr that has a good overview.
It could also very well be that other factors on your report slightly changed during that week time-period and slightly reduced your score. With changes in the FICO model, it would be uncommon for a credit score to drop strictly because a credit was run again and within such a short time-frame.