IS and FPC Company contribution

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Hello Tech, 

I have a question on Company contribution (TAX) for IS and FPC which is supposed 1.2% that is for ivory coast. i have scenario where since august it has changed for two employee whom i have added other allowance.the previous figure was 2411 for both IS AND FPC but when i added other allowances FPC has changed from 24611 to 34356.43. my question is is this supposed to change whenever an earning has been added.i have not interacted with Ivory coast tax calculation before i want somebody to explain how it work so i wll be able to understand how IS and FPC operates. i have attached screenshots.