This makes no sense whatsoever. Where is that 4503 coming from? That’s clearly not the billboard that you’re showing in the image. Do you see the same value printed always?
Are you sure that your platform actor does override the position of the billboard somehow? Are you setting something on tick, begin play, construction script in the platform actor? Reading the value of a variable and sending it to the billboard.
If you see one value printed and another result in the game, something somewhere is being overridden and we can’t see it in the examples you’ve presented.
Sadly, I really can’t afford dedicating more time to this 
Good luck.