I have made a test on my side and don't have the issue that you mentioned. My PowerApps app's configuration as below:
Please take a try to save your PowerApps app and close it, then re-open it to check if the issue is solved. In addition, you could also consider take a try to set AutoHeight property of All Label controls within your Gallery control (Flexible Height Gallery) to true:
You could also take a try to re-create your PowerApps app and then check if the issue is solved.
Community Support Team _ Kris Dai If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Hi @v-xida-msft, Thanks for taking your time. I have tried all those things you mentioned. This issue is not consistance sometimes labels get overlapped. and if I naviate back and forward then UI renders properly. I am not sure if this is a issue with powerapps or am I doing something wrong.