Hello,
Thank you all for bringing this issue to our attention.
We understand that some of you aren't able to see all the EVOs in the Rewards tab in the game. This could be because you have many available EVOs.
We've passed it on to the team so they can investigate.
In the meantime, you should still be able to see all your EVOs on the companion app.
[Edit] One workaround found by csgentile is to select a player in the squads manager, open the radial menu, and select the option to view available Evolutions for that player. In the 8-option radial menu, this is the 1 o'clock position (upper-right). Then go to the Rewards tab.