I found that it was connecting an EventTick just makes it so when setting Day or Night some part of the construction will occur as many times as tick occurs. There was a way to get both working but not both in the same construction.
I eventually found a construction that worked.
I tried all sorts of combinations but it wasn’t until I set both casts of the gameInstance BP that held the boolean and S value for yaw to the same branch, set each cast to something different (EventTick & EventBeginPlay), and added a node to stop the set Nighttime from flickering due to how EventTick was coded into the sequence of nodes (it would affect both if I didn’t set it up without the Do Once, which I messed up the boolean for → start closed is not the same as a branch boolean, lol).
Thank you for your help, definitely got me to learn some new nodes such as switch which is very useful and this all got me to a better sequence of nodes involving just one branch. I never like putting one sequence of nodes to both EventTick and EventBeginPlay, just kinda messy, but thanks!