I have a weird behavior on Android phones, when the Calendar controls OK button is over a button like submit or gallery item.
After you pick the date and click on OK the item under this button is also triggered.
As example if you have gallery items under OK, the item that aligns with OK is opened or if there is a button, this button is triggered.
This worked fine until the last PowerApps update 3.18052.6.
In the Browser its fine.
On iPhone not tested yet.
In PowerApps editor which control is on top? The calendar or the button? If you look at the list of controls on the left which one is higher in the list?
Would you please share more detailed configuration of your app? Like what is the data source and is this calendar inside a form? I have seen similar issue before. But it should be fixed a long time ago.
Both apps have SharePoint lists as data source in the same tenant.
In the first case the Date picker is stand alone and are above the Gallery. Date picker is in the front of the Gallery.
In the second case the Date is a field in the SharePont list and the Form is above the submit button.
So far tested on Android Marshmallow, Nougat.
I reproduce the issue with the Service Desk template.
Steps to reproduce:
1. create a new app and choose Service Desk template
2. choose sample data stored to OneDrive for Business
3. in the TicketsPage insert a date picker
4. run the app and choose a date from the date picker
On Adroid phone
The record behind the OK button of the Date picker will also be triggered and will open this record in Ticket details page.
In the Browser
I am currently having this same issue in my application on Android. I'm on a brand new generated app less 7 days from today 1/30/2019. The app was generated on top of a SharePoint Online list.