Hello everyone. Recently I discovered something strange happening with my cards. Below are several screenshots to exhibit what I have seen.

First is a level 1 Duelist card. Please not the level 19 Footman, level 19 Druid Marksman, and level 20 Crossbowman. All three 1* card is at their final evolution stage.

I now use the level 20 Crossbowman to Enhance my Duelist.

I do the same with the level 19 Footman after removing my Crossbowman. Notice how both cards, of different displayed levels, give the same amount of EXP for Enhancement.

Now watch what happened when I use my level 19 Druid Marksman.

Below are the EXP bar for the above three cards used.