NOTE: I'm going to post this here because I'm not sure if this is working as intended and I just happened to noticed it now or if it is a bug. I would like the opinion of the community first. If it is indeed a bug I'll go through the steps and properly report it.

So, tired of FATE grinding and needing to level up Lancer so that I can acquire Invigorate for my Bard, I spent this afternoon doing an EXP chain party around Hawthorne Hut.

While doing this I noticed that the timer for the EXP chain will suddenly go up and down in blocks of 10 seconds. It looked like this:
Engage a mob, EXP Chain Timer is ticking down, Kill a mob, timer is at 19 (the time it was when I first noticed), as I'm move to the next one the timer jumps from 19 to 9, engage new mob, timer comes back up to 19, immediately goes back to 9 and keeps counting down.
It happened several times while I was playing. Has anyone else seen this?