Clearly a sign of an overactive adrenal gland.
To quote the Wiki
"In addition to its affinity for the androgen receptor, DHEA has also been found to bind to and activate the ERα and ERβ estrogen receptors with Ki values of 1.1 μM and 0.5 μM, respectively, and EC50 values of >1 μM and 200 nM, respectively. Though it was found to be a partial agonist of the ERα with a maximal efficacy of 30–70%, the concentrations required for this degree of activation make it unlikely that the activity of DHEA at this receptor is physiologically meaningful. Remarkably however, DHEA acts as a full agonist of the ERβ with a maximal response similar to or actually slightly greater than that of estradiol, and its levels in circulation and local tissues in the human body are high enough to activate the receptor to the same degree as that seen with circulating estradiol levels at somewhat higher than their maximal, non-ovulatory concentrations; indeed, when combined with estradiol with both at levels equivalent to those of their physiological concentrations, overall activation of the ERβ was doubled. As such, it has been proposed that DHEA may be an important and potentially major endogenous estrogen in the body."
You probably can't be bothered to read that. But in summation. DHEA won't cause high E2 per se but it has a high affinity for an estrogen receptor and possible estrogenic effects.
I wouldn't worry about it. Why did you get your levels checked? Did you just start taking creatine and wanted to see how it was affecting you? Why are you checking your cortisol. Your 18 year old do you have a history of health problems? If not why are you doing this? If you have no trouble breathing, eating, pooping and can ejaculate your probably healthy