Lib has BUG when inserted with a special sequeces

I insert the tree with a sequeces of [13,13], [24,24],[37,37],[90,90],[53,53],

But  after [37,37] inserted,  I cannot find [37,37] in the tree by `find` API!

I have made a research  and found this lib lacks the necessary update for the max field of these rotated nodes because unbalancing