Issue Summary

On your Trello mobile app, using the Calendar view on your board, when you scroll up and down the cards to look at due dates, it also unintentionally marks them as complete/complete. We were only able to replicate it on Android but users mention that it's happening on both Android and iPhone app.

Steps to Reproduce

1. Open the Trello mobile app
2. Go to a board
3. Select the Calendar view
4. scroll through the dates up then scroll down without intentionally marking any cards as complete

Expected Results

The cards that are not marked as complete will stay as is. Same with the cards that have previously been marked as complete. 

Actual Results

This happens intermittently but when you scroll up and down repeatedly, using the left side of the screen, you will eventually see some cards that will now be checked once you scroll back down. Sometimes you don't see anything that has changed but when you check the Board history, you see the cards that you have marked as complete/incomplete. 

Workaround

Use the Timeline view in the mobile app as there is no option to mark cards as complete there. Or use the desktop version for now.