Pressure line in residual plots

I’ve run my project about HVAC and I have some question about convergence plots. Pressure line in residuals plot has never go down lower than this (in the picture) although I run many conditions.

Can anyone tell me what I should do.
Thank you so much!

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Hi there,
Thank you for reaching out to us.
Can you share your project link? Thank you!

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here is project link:

thank you!