Further information:
After further attempts to correct this, it is now happening between 844 and 1076 px…maybe I was mistaken the first time, I don’t know.
@media arguments in stylesheet become numerous to keep this moving fluidly…hoping a better solution is available. Maybe, I just need to undo the original change…but the left side of the logo (290×90) was being chopped off on 4:3 displays.