Visa extension (wrong IHS calculation) for dependents while primary visa holder has switched to ILR

Hello, I had received Global Talent visa about a year and a half ago and have moved to ILR since then.
Today I was trying to extend the Global talent dependent visa for my partner (who needs another year to qualify for ILR), but the IHS amount we are getting is for 5 years! which is a lot. How can I resolved this?
If I am submitting UAN reference of my previous Global talent visa, they are getting their visa extension just for few months (upto the expiry date of my previos Global talent visa).
Please help!!!