Problem with IHS website payments

Hello fellow ukvisa applier,

Me and my wife are trying to apply to a Tier 2 (shortage visa ) and Tier 2 ( dependant) visa, and applications on main site going smooth but as soon as we directed to IHS website the site cannot pull our information correctly and completely. This causes site showing no dependants linked to main application and calculating the dependants IHS charge as if dependant applying after the worker stationed in the UK. Which causes a £500 gap from IHS's official charge calculator. (I won't even going into ludicrous exchange rate the site is offering us)

Anyone knows how can we link two applications together so it shows the right information and price?

TL,DR: IHS's website is a mess for us and we could not figure out how to fix it, help please.