I've been meaning to post this for a while now, since before the Recently Played tab was not refreshing (at least for me) after 2 games every log-in. Now, however it is not refreshing at all even when logging back in. This has occurred for several days for me.
To most this isn't noticeable but as an avid ARAM fan, I really enjoy reinviting people I vibed with and would really enjoy this feature working as it is intended to. Hope this post helps that effort.