Itll let you go up to six weeks in the past and submit up to your average hours. Even a few hours spent on previous weeks should be able to help spend some and allow you to keep accrueing.
Each vacation & personal holiday bucket accrue at their own rate & cap out at their own rate. Cap out is 1 1/2 times your yearly accrual. So.
Vacation pay, If you accrue 1 week a year (40hrs) your cap is 60. If you accrue 2 weeks (80 hours) you cap at 100. So on an so forth.
Same for personal holiday except it's a lot less. If you accrue two personal holiday days (16 hours) then you cap at 24. If you accrue 3 personal holiday days (24) you cap at 32.
You'll know what your accrual rate is on the pay tab on targetpayandbenefits.com
If you still have problems catch up with your store HR, they should be able to help