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LingakuLingaku[subject] + [adjective] + 了 + (一)点儿
Adjective + 了一点儿 says something misses what you need by a small amount: a bit too big, a bit too late. 一 is often dropped: 大了点儿. It is spoken and neutral.
The measure is a need or a standard – the size you wear, the time you agreed – so the sentence often reads as a polite complaint.
有点儿 + adjective says how you feel about something: a bit big, and you don't like it. Adjective + 了一点儿 measures it against a need: a bit too big for this.
The same words can report a change: 胖了一点儿 can mean "has put on a bit of weight" as well as "is a bit too heavy". Context decides.
In this pattern 一点儿 goes after the adjective.
了 goes between the adjective and 一点儿, not at the end. Without 了, adjective + 一点儿 asks for a change: 便宜一点儿吧 "make it a bit cheaper".