Secret Passage vs Outerworks

[Bluejackets]

Our team is building the field and ran into a snag. From the end of the outer works to the edge of the secret passage there is a gap around 20 inches. We have scoured the game manual, double checked everything, and are still coming up with a gap. The game animation shows that they should touch.

If we are correct the outworks should be 240" (48" x 5)
The secret Passage is 53.5" wide. In our math is correct that is a gap of 25.5"

The field is 319" wide. That leave us with a gap of 25.5"

Any suggestions?
Thanks for your time and help