I hooked two water heaters and I getting hot water coming out of cold side on both water heaters

Recheck your ins and outs.
Water goes into the cold and out of the Hot.

Agree with above post. You should check your installation. If you snap a photo of it and post it for us, we will identify the problem. Milo

I do have to wonder how you know hot is coming out of the cold, It is ususually under pressure?

Is your complaint that you have hot water coming out of all the cold water taps or is it that both cold water lines going into the heater are hot? Let me know, Tom