Thank you for using Syncfusion support.
We have checked the reported query with our sample in the reported device iPhone X/XS in Simulator. But, unfortunately we are unable to replicate the reported issue.
Could you please check with the above sample?. We suspect that the issue may occur at particular scenario as existing in yours. So, we recommend you to revert us the issue with reproducible sample or replication procedure to reproduce it which will help us to analyze your query better and provide appropriate solution at our end.
Dinesh Babu Yadav