On Minecraft Bedrock Edition the paid skins that I equip and save will switch back into the Default Skins (Steve for example) whenever you start the Minecraft application back up. This usually happen when I log back in after a day. This is a frequently occurring bug.
Related issues
Comments

We're tracking this issue as MCPE-32089, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you aren't already, please don't forget to use the search feature, the less time volunteers spend linking duplicates the more time we have to update new reports.
Voting on an existing report has a greater impact on getting the bugs most important to you fixed!
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki