RTF is a global modification that replaces all towns in the game.

Similarly, the spell icons indicate their school (standard), so the "lightning" spell is in the magic of air, and therefore the outer frame has become light blue, while the background on which the lightning is located remains red.
Here, for example, is the summoning of elementals: I reworked the summoning magic into its original form, and had to redraw the icons - as you can see, not only the frame has changed, but also the background on which the spell is located.