Well, yes. That seems working as intended. Determination has much less weight than other stats when calculating output. 101 is a relatively small difference as well so you're definitely not going to see a huge difference. I'd guess a difference of about 25-30 points of damage/healing on average. This is part of the reason why crit is generally seen as a superior stat. (The rest of the story being that crit increases both the chance of and output of crits so it double dips.)

Whether one feels that 'working as intended' is good enough or not is a different question, but this isn't a bug.