Things to check. You are only pay protected for the trip as it stood at your show time. So, in this case, for the two day. Everything AFTER your two day is paid at ACTUAL BLOCK only.
Check the next pages of your pay register (F8 ) and see that your pay for the first two days shows your block or better pay. Then make sure day 3 and 4 are being paid at what you actually flew. Best to check against your red book, but know that there will be a few minutes of discrepancy due to main cabin door/bag door issues.
Add up the four days...I bet it adds to 13:08. If not, pay claim what is missing.
Also, you can email your pairing to
xjtcompliance@alpa.org and they will look at it to make sure it was paid correctly.
Edit to add: The pay register is what shows your "official" pay, not the PAYT on your master schedule.