Sleeve sagging?

I am currently working on the Pippi Pullover by Lea (kisskiss.rhinestones) with an custom colourwork chart added to the body. The body went perfect and I finished one sleeve a few days ago, but the sleeve kind of sags weirdly? It is is large circumfrence for the sleeves (140 stitches) so I know a lot of people add decreases, but I like a wide sleeve so just knit the pattern as instructed.

The best way I can describe the sagging is that it is like the underside of the sleeve is heavier than the front, so the underside of the sleeve hits around the base of my thumb whereas the front hits just above my wrist. I haven't blocked it yet so I don't know if it will block out or something (I'm fairly new to knitting if you can't tell lol) but I can't find anyone else that has had this problem and I don't know how to fix it. I am knitting this for an event which is at the beginning of October, so I am eager to get it finished as soon as possible.

I am currently away for a few days for work and working on a different project, so I thought I would just post my question and see if there are any suggestions or advice while I had a few days where I can't work on it anyway. I also know a picture would help with understanding what I mean, but I can't take one right now so I apologise for that.