When attempting to navigate any GUI element, the game acts as if the left stick is being moved. This doesn't affect the movement of the player, that's fine. Restarting the game solves the issue.
Linked issues
Comments 2
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-33895.
Please add a vote and any new information to the main ticket, which will be updated accordingly. (Pressing the d-pad is a temporary workaround to resolve the issue without needing to restart the game)
If you have not, you might like to make use of the search feature before making a new ticket, as it's likely that the issue has been reported already.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Feedback – 📖 Game Wiki
I have also come across this issue and this is a known bug. The issue seems to be that the d-pad gets stuck in a certain direction. If this bug appears again, you can press the d-pad in the direction which it occurs at.