What am I missing? (Reaching catastrophic phase)

[InsuranceKnight]

Noticed several of my PDP reviews are reaching $0 well before the $2000 cap when looking at the monthly breakdown.
Below is one example.
Thoughts other than Medicare.gov is calculation wrong and producing wrong estimates?
What am I missing?

 

[Winger]

Uses Medicare standard model of part D to calculate costs to the $2000. $590 deductible and 25% of drug costs. Doesn’t matter what member is actually paying. I believe…

 

[InsuranceKnight]

Sorry. Not following. I don't see how they're reaching $2000 from the screenshot above. FYI, the screenshot above is AARP's $0 deductible plan.

 

[InsuranceKnight]

Here's another example with a deductible plan.

1. January: Takes all meds; Meets the deductible immediately w/ cost sharing = $711.80
2. Feb & Mar: $182 for the only medication w/ Mounjaro = $182.01
3. April: Takes all meds; $376.29, but Walmart shows $372.19 which I'm assuming it's entering catastrophic phase.
4. May-Dec: Showing catastrophic figures of $0 for remainder of the year.

Clearly those figures don't add up to $2,000.

Everything I read says the $2k cap is based on what the bene pays. Is it also factoring in what the drug manufacturer contributes?