Copy of Cue - takes over anothers contents

[SoleJan]

Hello again,
so we've hit a new problem while a small concert was going on in our school. 
Another "crew member" created a cue without any effects, just a static cue with some positions changed. To be more precise it was Cue 50/1.
Now, she made a cue on another playback. Basically she wanted 50/1 to go to 27/2 - 27/2 is a cue with effects, mainly rotating wash heads and a rainbow color. 
Every time we copied the Cue on the third page to the one on the second, the 50/1 also started to have the same effects, effectively copying the other cues contents.
Why is that happening? 
My only suspicion is that the showfile was originally created in the earlier software version without pages 3 and 4. Can that be a software error or are we just missing something.

Thanks in advance,
Jan