timing marks don't line up after rotating the crank
 

5.4 with PI heads, 1 piece crank sprocket, pressed-on cam sprockets, chains have 1 marked link, and 2 marked links 180 out.

Should the marks line back up after a certain number of rotations? The left bank (driver side) cam sprocket mark goes back to 12, and the right bank (passenger side) cam sprocket mark goes back to 11 after 2,4,6,8,10 and more even-number rotations. It seems right but doesn't look right.