Verb normalization of こだわらなさ


I'm confused about how I should parse こだわらなさすぎだ in this sentence.

> お前は １つの問題に こだわらなさすぎだ 最後まで諦めんなよ

From the context of the show I was watching, I'm pretty sure that this means
"You focus too much on one problem (on a test). Don't give up until the end."

I thought that こだわらなさすぎ would mean "not fixated enough (on a problem)" since
こだわりすぎ means "to be fixated too much".

Is there a difference between saying こだわらなさすぎ vs こだわりすぎ?

