Hi montos, we have a bug that only the target card and material card being on the same page can the target card be evolved. Please try using different sorting methods to get both cards on the same page and you will be able to evolve the target card. Sorry for the inconvenience this caused. We have fixed this problem and it have been rolled out in the version 2.0.2 which is already available on Google Play and iTunes but not Amazon.
Please post Dragon Era related topics in Dragon Era forum next time:
viewforum.php?f=34