IHS for Tier 1 Dependent is calculated higher

Hi,

I've ILR with validity till 2024 through Tier 1 General route. I'm applying for Tier 1 Dependent extension application for my wife (Visa Route: PBS Dependent Tier 1).

While paying the IHS, it asks for the following question after entering the mail applicant's details.
"Are you applying to join or remain with a person already in the UK?
+ Add this person's details
You don't need to add this person's details if they are a UK or EEA citizen."

At this stage , if I enter my visa expiry then it calculates the IHS fee as £1600 which seems to be wrong. As on the main site, it shows the IHS charge for Tier 1 dependent applicant is £600.

Could someone please advise ?

Thanks

DO NOT enter hour details. They must apply alone.

You meant in the IHS form or in the online PBS dependent form?

Probably both. PBS Dependents must apply alone.