This is my first time ever having a cast iron. It came pre seasoned but after booking on it we wanted to season it again

I washed it how you’re supposed to and then put it on the burner to dry completely but it got too hot and a huge part of it turned grey

According to Google I just burned the seasoning which I didn’t really care about because we planned on re seasoning it anyway

We went through the whole process of re seasoning it yesterday but this morning when I looked at it, it looks like a big orange spot.. is this rust??? How do I fix this????

Also my husband accidentally used olive oil to season it instead of canola oil like I told him to use 🙃