fix flutter project ios and upload app store

My problem is very strange
I have a flutter web browser
When it works for the first time, it appears unresponsive
It like page zoom automatically
When you exit an application and run again it
It runs normally
responsive and good
I don't know why, please solve the problem
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After solving a problem, please upload an application again on the platform app store version
Now they rejected my app because of this problem