I've had a similar thing happen when smoking several doses of DMT in a row, or using DMT too much. I know that any amount of the other crap in mimosa extracts ruin the trip like that.. feeling underwater and everything looks really awful. I never could 100% figure it out though whether it was totally because of the jungle alkaloids or just DMT itself acting really weird occasionally.
Its possible that the DMT had a little of the jungle alkaloids in it (there is other stuff in mimosa extractions that sometimes comes out), but the DMT overpowers it at first until you smoke it many times in a row not leaving at least a day in-between.. and since you have a tolerance to the DMT the jungle stuff takes over... i've had this happen to me.