Extensions are not loading with Burp defaults

Hi Team, I always use Burp defaults option for configurations while opening/creating projects. I have a few extensions installed such as Retire.js, TokenJar, Active Scan++, etc. What my issue is that all the extensions are getting uninstalled except Active Scan++ and Auth Matrix. I need to reinstall other extensions each time when I open existing or creating new projects. In the case of Auth Matrix and Active Scan++, these are getting unloaded under the Extensions tab. Need to check again to load these extensions. I am using Burp 1.7.37 for more than a year. Kindly help me to overcome this.