ACR and Stitching From RAW Files

I see something peculiar happening on recent stitches.
I have say, three frames to stitch from RAW. One frames a little overexposed, so I open in ACR, drop the exposure to compensate and save. Then I open all three frames in Photoshop>Merge as RAW files. When the adjusted frame shows up, the adjustment is ignored.
I can fix this by opening the other two and do a very slight change to them, save, then all three show up as expected, the bright one matching the other two close enough to get a uniform stitch.
Now I am doing this as a quick test of the stitch, to see if I really am interested, and if so, I go back and open all three in ACR and make the corrections. After doing all three, I can uncouple the bright one and tweak its exposure, then save and stitch, no problem.
Is this normal?

I am selecting the images after making the raw adjustments in Bridge and selecting Photomerge under the Tools.
I haven't experienced this either until now. The difference is that Iwould always select the images and open in ACR first, and run the corrections synchronized. Occasionally, one would be off enough to require special tweaking so after the synch corrections, I would select it, correct it then click Done. Getting a bit lazy, especially with many panos waiting, I do a quick test and in this case, only one of the three needed tweaking. Running Merge as above ignored the tweak.
Try it yourself. Pick some images to merge that have not been through RAW, and tweak one only in ACR. Click Done then Photomerge from Bridge under Tools.
I've done this twice now, after exiting Bridge and Photoshop first.
Make that three times
Message was edited by: Hudechrome

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