I completed two unique paths of TA Explorable tonight, and on the second path I received a diminished reward at the completion of the second path final boss. The first path completed ended with Laurent as the final boss and was completed around 10:30pm EST on 9/26. My second TA path completed was the path in which Fyonna is the final boss and this run was finished around 12:00am EST on 9/27, so about 90 minutes after the first run wrapped up. The group for both paths was comprised of the same members, and 4/5 received the proper 60 tokens as a reward for the second path, with myself being the only one experiencing the bug. In this instance, I received 45 tokens, 133k exp and 19 silver as my final reward. The only thing I can think of is that I was dead, in immediate vicinity of the boss but not downed; dead, when one of the bosses was killed.
Those two instances were the only two I have completed today, so I can’t imagine that amount of limited dungeon experience for the day can be considered “excessive”.
Hope it helps to squash the bug!