I can see 'how' it occurs...
IC43/2 goes HIGH.
The first clock pulse comes along on IC43/3. A LOW to HIGH clock edge on IC43/3 causes the HIGH on IC43/2 to propagate to the Q output (IC43/5).
This will be propagated through IC44 by two clocks of the 4 MHz system clock.
When the HIGH gets to IC44/Q output pin (not connected) IC44 pin 8 (/Q) will transition from HIGH to LOW.
This will cause the S/R flip flop (consisting of the two cross-connected gates of IC42 to enable the signal at IC52 pin 1.
Now, if the original clock input pulse at IC43/3 is sill there - it will propagate through to IC52 pin 3 (hence the ghost).
Likewise, the gates in the flip-flop chain could be operating too fast - thus achieving the same ghost.
What devices have you got in IC41, 42, 43 and 44?
Dave