Mods Reverting Ranks

[Elkaiozen]

Twice this has happened best I can tell the steps to recreate it are.

 

1) i set my mod loadout than hit apply

2) I than go back into the weapon hit mods and pick a mod (first time was beserker / second time was constitution)

3) apply all fusion cores to the item and hit apply

4) than I add a bunch of random mods I had duplicates of and hit apply.

5) After this I look and the item has ranked up appropriately.

6) I close the mod screen only to see the weapon loadout screen still has the item unranked.

 

This bug has cost me about 100 duplicate mods and 60k credits and neither item ranked up at all.

[NovusNova]

Send in a support ticket to DE.

 

https://support.warframe.com/

[EverythingNagato]

Try restarting the game engine.
If nothing occurs, make a ticket like suggested.