The restart is going to fix the party share issue.
Here's what's going on and why you are all very correct about the experience feeling lowered.
If in a party, and you see the monster as yellow or above, there was a typo and it was resulting in a penalty as if the monster was light blue. This will be immediately fixed, as you've seen, a maintenance announcement has been made.
We do apologize for the inconvenience this has caused anyone and we'll discuss a short term experience bonus period to help recover the effort.
^ This! Thank you so much Sir Leonis for your immediate response and solution
Servers are back up!
I will try to experiment party sharing later and compared it from the experiences we gained before this patch v30 and after, since I both have screenshots of those.
I will be back in-game when I return to my home, thanks Sir ShazamO