Hi Tamas,
Greetings from Syncfusion.
We prepared a sample with picker control and test the picker control based on the given scenario. The picker control works fine in both android and iOS and we are unable to reproduce the reported issue from our side. Please find the sample from the below link.
Please check our sample. If the issue persists in your side, please provide the following details.
1) On which device configuration are you running the sample.
2) Which version of SfPicker control are you using.
3) Are using customized picker or normal SfPicker.
Regards,
Paul Anderson