Finished MR 27 test but I'm still at MR 26 - PC Bugs - Warframe Forums
Mastery Rank 30 - True Master - The Daily SPUF
Noob advice : don't do mastery rank test while a warframe update is pending. You won't be able to do it until you restart the client, and if you click to do
Mastery Rank | WARFRAME Wiki | Fandom
Warframe Mastery Rank Test Guide (Rank 1 to 30) and How to Rank Up Fast