To see the other backups - click on the Timeline button to select the date range.
Note: I would highly recommend that you change your strategy. Using a single file to contain multiple backups and types of backups is - in my opinion - very risky. If something happens to that one file and you needed to restore your system, you could lose more than a weeks data.
I would recommend that you have each file date stamped and have an individual file for each backup.
Jeffrey Williams
“We are all faced with a series of great opportunities brilliantly disguised as impossible situations.”
― Charles R. Swindoll
How to post questions to get better answers faster
Managing Transaction Logs