Unfortunately the only fix is either to restart your Mac or to restart the iCloud Photos process.To force iPhoto to refresh, open the Activity Monitor app and search for 'photo'. One of the processes that will come up will be iCloud Photos. Select this process, then click the X button to force the process to terminate.This process will automatically restart, iPhoto now will refresh
Please reply and let me know if you need any other assistance or if everything is good, take a moment to rate my service by choosing one of the stars at the top, then click submit.
Thank you very much!