More info here under FAQ’s and ‘Why did my Progression Levels Change’ > ‘FTP Increase’
If you think something is amiss though and the drop was too severe, best protocol is to check in with support@trainerroad.com so they can take a look.
Keep in mind though, those Progression Levels are just speaking to where you’re at, dont put too much weight into those numbers! Easier said than done though, right?! 