Thank you for contacting Syncfusion support.
Based on the provided information, we have checked the mentioned issue with ListView in Xamarin.Forms and we unable to replicate the issue and it is working fine as expected from our end. We have prepared sample for the same based on the provide code and attached for your reference,
Please check the sample and let us know if you still facing the same issue? If not, please modify the sample based on your scenario and revert us with the tested device details, it will be helpful for us to analyze and resolve the solution at the earliest.
Subburaj Pandian V