Question about Stat

Hi, can someone please explain to me, how to read the betsizing stat.
This is a 3bet pot Sb vs BB. And I try to find out the most used betsize on the river. So how do I interpret those numbers?
So the Overbet shows 6.4, and that´s the highest number there. So can i assume, that overbet is the most used betsize? But why is then the samplesize in ( ) the lowest there? it´s a bit confusing. Can somebody please help me?
Thank you

Ok problem solved, i don´t need an answer here.
Thanks.