Swollen/enlarged vulvas can look weird, and not at all masculine, and are going to be more prominent. I can understand you having dysphoria from having your female organs enlarged. I also know that with most trans people, the changes of an effective transition can bring out increased dysphoria, because you notice what HASN'T changed against what has.
Alternatively, you may not have dysphoria for your female genitals. I get euphoric for female traits, and generally dislike being perceived as too masculine, but I don't get very upset by my penis, except maybe it's inability to please me in bed.