One might be tempted to call this crosstalk, the result is pretty much the same, but actually in a technical sense it is not crosstalk. Neither can it be conciddered a bug in Poser, at least not in P5 and up. It results from the delta injection poses being constructed in the wrong way. DAZ and many others use slaving code in their delta injection poses that points to (targets) "Figure 1" and an actor number of ":1". The code will look something like this:

actor lShin:1
    {
    channels
        {
        targetGeom Moprph_01
            {
            name SomeMorph

            FBM_01
            deltaAddDelta 1.000000
            indexes 76
            numbDeltas 358
            deltas
                { 

With this code syntax it is not surprising that the morph channels get slaved to the wrong figure (usually the first one loaded) because this is the figure that the injected slaving code points to. It is better to leave the figure and actor number out of delta injection poses, and use a syntax such as this for the slaving code: actor lShin { channels { targetGeom Moprph_01 { name SomeMorph

            FBM_01
            deltaAddDelta 1.000000
            indexes 76
            numbDeltas 358
            deltas
                { 

This is the syntax I use in my own delta injection poses, and I experience on problems injecting into multiple figures in P5. To have this work in P4 you will need to use null figures, otherwise the slaving will break down after a save and reload to pz3. You might like to take a look at the thread where Maveris brought this solution to light: Open letter to DAZ Developers