Mastery Rank and Experience lost

[Geostalker]

Hello before my mr rank was mr 27 include 502 item (weapons, companions, warframe, archwings and more). but after update i lost around 5000 experience (i do not remember exactly how much experience i had before) including 2 items, after update i had 500 items only. also i lost master rank 27 cos gap was pretty small between mr 26 and mr 27. several days after hotfix i gain around 3000k experience and get back one disappeared item. but still did not back mr 27 i had left around 40 experience only for rank up. till today i have not back another item and experience, i ranked up mr 27 with new items from new update without doing any mastery rank test but still missing one disappeared item and experience. DE should fix it too. i do not know if have other players same problem to maybe lot of players cant see any difference i only get it becouse of mr rank lost.