Tripod Bug? did they stack now?

a mate of mine has 3 lvl 1 tripods with the same effect and got a visual “bug” that he has now a lvl 4 tripod!

BUT is it a visual bug or did they change anything and they stack now?

Mine don’t stack so maybe just visual bug? Or he has a lvl 3 he didn’t notice

he isnt even 1370 yet so he cant have a lvl 3