Help: Why is Initial value changed after calculation?

Hello, everyone. I build two models （both are PDEs）in one file.

For the first one, initial value is A0,　 a log-normal distribution.
For the second one, initial value is B0, 　also a log-normal distribution. It uses the result of first model as an input parameter.

Then I solve two PDEs together. When I get the solution of the second model, I plot solution at time 0. Theoretically it should be the same as B0. But I get a totally different value. Why does this happen?

I've tried to use finer mesh grid and smaller tolerance value, but it doesn't work.

Thanks for your help.