That almost sounds like something might be missing from the install, unless it is a Steam or Win10 quirk. Might be worth doing a fresh install and carrying your save game over to the new one see if it still persists (make sure to delete the files recommended in this thread).
Alternatively, you could try v2.6
It's so long since I've actively worked on this my memory's a bit vague about what you have. I'll try a new install here and check all is as I remember.
If I understand correctly, it's the castles you see ON the map, and not the review panel graphics. I don't see how that can happen, as the old ones should have been overwritten by the ones I borrowed from HTW. So, as I said, I'll try it out here and see what I can see, and get back later....
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