[CLIENT] Champion "Season Highest Grade" not registering / updating

Something appears to be very buggy on the champion collection list where it doesn't update at all the season highest grade stat - and it hasn't for several weeks now. I've tried restarting the client, restarting my router, and even tried restarting my entire pc and regardless it never updates. A bunch of champions are listing "Not / Applicable" for their Season Highest Grade listing even though I only bought them and gained a mastery point this season. Beyond that there are champions with a listing of a much lower "highest" than actually happened.

As far as I can tell the last time my "Season Highest Grade" actually legitimately updated for every character correctly was back on 05/22/2017. Considering it is now 06/06/2017 that is a long time. Over 2 weeks in fact of no updates. In that 2 week period only one champion correctly updated when match finished and there is no explanation as to why that one champion updated when none of the others has.

Examples of my non-updating champions: Garen "Season Highest Grade: B+" Garen S 26/1/0 05/23/2017

Blitzcrank "Season Highest Grade: B" Blitzcrank S+ 10/2/16 06/04/2017 Blitzcrank B+ 2/5/9 06/04/2017 Blitzcrank A 4/1/0 05/31/2017 Blitzcrank S- 9/6/13 05/30/2017 Blitzcrank A- 9/8/5 05/29/2017

Ahri "Season Highest Grade: N/A" Ahri C+ 6/9/19 06/05/2017

Ryze "Season Highest Grade: N/A" Ryze B- 0/4/16 06/04/2017

Warwick "Season Highest Grade: N/A" Warwick B- 3/3/7 06/04/2017

Master Yi "Season Highest Grade: N/A" Master Yi A- 4/2/5 06/03/2017

Sona "Season Highest Grade: N/A" Sona B- 0/9/11 06/05/2017 Sona B- 2/5/9 06/04/2017 Sona C- 2/7/7 06/03/2017 Sona B- 1/7/17 06/01/2017

Sivir "Season Highest Grade: N/A" Sivir A 8/2/2 05/29/2017

Shaco "Season Highest Grade: N/A" Shaco B+ 11/4/15 05/28/2017

Thresh "Season Highest Grade: N/A" Thresh A- 6/9/17 06/01/2017 Thresh A- 7/0/8 05/31/2017 Thresh B- 3/5/2 05/30/2017 Thresh B+ 3/7/15 05/28/2017 Thresh A- 3/5/8 05/26/2017

^ That is just a short list of non updated "Season Highest Grade" champions for me. In total I have 24 champions listed as "N/A" even though they have all played in PvP matches this season. And I have a bunch of additional champions that show a lower "high" than their actual high.

Now the weird  thing is that one  of my champs did legitimately get their high updated after a match on 06/04/2017. As far as I can tell there is no explanation as to why one updated but all the rest did not.