Is it weird that I am a girl but a lot of male seinen manga turns me on a lot more than female smut?

Oh no. There's definitely NOTHING weird or out of place and wrong with how you're feeling at all. So go right ahead and enjoy what you're currently reading like before

Well, just because you don't represent the intended target audience it doesn't imply you should read manga which is believed to be more suitable for you.
Nevertheless I'd like to point out that from what you listed as preferred pieces of entertainment only Hellsing is actually considered seinen, whereas the rest is mostly shōnen with some shōjo mixed in.

No not at all fan service fan service though if I had to choose I'd pick the opposite but that's my opinion I got nothing against people who like it unlike other haters who I come to argue with from time to time