[GAMEPLAY] Cooldown INCREASING After Buying CDR Items

Okay, this is VERY strange. I tried to look this up to see if it was a new update or something but could find nothing. Here's what I experienced:

As I was in an ARAM match playing , I had purchased these items:

, , , , , and . (Random, I know) And this totals up to 40% CDR with just the items. (+5% from mastery).

At one point, the items I had gave me a CDR of 35%. At another point after buying more items, I had max CDR of 45% due to my masteries.

HOWEVER: While I was in battle, I noticed I was not able to quickly cast spells which was VERY bad because as a support, I need to be able to use my spells quickly. Because of this, I checked to see what my CDR was and I noticed that my CDR was being REDUCED back **down to 15% and 25% ** respectively as I gained CDR items... Now, AFTER I died, my CDR went back up to what it was supposed to be. This happened the entire game and it caused me to be a poor support because I couldn't cast my spells as often as I needed.

Someone, please tell me this is a bug... Because if this is a new mechanic via item, mastery, champ skill... I absolutely_** hate it.**_ And I am absolutely NOT mistaken that this happened. I watched it multiple times.