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If you look at the very bright stars and the cluster at 10 o'clock you'll notice the stellar profiles are gone. This is because when you balance the dynamic range to blend the panels, the one with antares and the yellow neb is very different from the one with the cluster. Once you blend them in, one has to give. In this case the cluster got black clipped. There are two things you can do to avoid this. Do a pixel maths prior to join them or save scaled data and cheat a little in the stretching. The final histogram in PS doesn't reflect individual panels clipping. Once you join them the histogram will show the whole picture
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