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When modelling a system with an algebraic loop in Simulink, the solver used to simulate the system will attempt to estimate the initial values for the variables in the loop using an iterative process. This process is called solving the initialization problem or initialization loop.
The solver starts by guessing initial values for the loop variables and then calculates the other variables in the system until it converges to a solution. However, the initial values may not match the exact values specified in the IC module due to the solver's initial guess and initialization process.
You can refer to the documentation on algebraic loops to gain more insights into the working:
Here’s a MATLAB answer that talks about assigning initial values to a closed loop : https://www.mathworks.com/matlabcentral/answers/1895580-how-to-assign-initial-values-to-closed-loops-in-simulink.
Please note that unless Simulink complains about the algebraic loop it is advised to use the automatically calculated initial values because setting the initial values manually can be time-consuming and requires a good understanding of the system being modelled. It may also require a lot of trial and error to find the correct initial values. Additionally, manually setting the initial values can impact the accuracy and stability of the simulation, so it is important to test the system thoroughly after making changes to the initialization values.
Hope this helps!