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Hello everyone. I’m hoping to get some advice on how to make my lawn more consistent. It’s only 18 months old. It’s new zoysia sod. But it seems to be getting infiltrated by buffalo grass also. At least I think it’s buffalo grass. Trying to get some advice on how to treat it so it’s consistent zoysia. Please note that I fertilized in June and also treated a lot of yellow Nutsedge with roundup safe for lawn. I am located in NorthEast Florida.

It's unlikely to be buffalo grass in Florida. Unless you're using the Australian definition of buffalo grass, which I think is called st Augustine in the USA.

In the USA, buffalo grass is a native prairie grass that mostly grows west of the Mississippi.

Thank you. It must be St Augustine growing within Zoysia. I’m not sure if there is anything I can do to make the yard more homogeneous.

It's really hard to tell from those pictures. What is most likely is bermuda invading the zoysia. If you mow the lawn at the mower's highest setting, then you have a chance to minimize the bermuda.
Nutgrass is a swamp type plant that thrives only in soggy soil. Technically it is a sedge and not a grass. What is your watering schedule? How often and for how long do you water? You should be deep watering roughly once every 2 weeks. If you are watering every day, like most Floridians, that's why you have nutgrass.