I put a Forma on the wrong Weapon or Warframe!
Unfortunately, much like an Orokin Reactor or Catalyst, once a Forma has been applied it cannot be removed.
I tried to remove a polarity but I couldn't. And now I lost a Forma and my item's rank reset.
What most likely happened is you did not select the correct polarity when trying to remove the polarity. To remove a polarity you must cycle through the polarity until you see a blank hexagon with no polarity symbol, as shown in the screenshot below:
If you select no polarity and hit 'Apply' you will lose a Forma and reset the item's rank without making any changes. If this happens please submit a support ticket immediately and we will assist you fixing the issue.
I tried to polarize my weapon, didn't register properly, tried again, and now 2 Formas were taken away for 1 polarization, and it shows that I got 2 polarity stars from it.
Please send us a support ticket immediately after the issue occurs and if we can confirm the error we will fix the item's polarity count and return a Forma to your inventory.
I accidentally put the wrong polarity on a weapon or Warframe!
If you accidentally Forma'd a weapon or Warframe with a polarity you did not intend to apply, please file a support ticket immediately and refrain from using the item in question until we get back to you. While a Forma is non-removable once applied, we can modify one slots polarity as as a courtesy if reported immediately. Please make sure to include in the ticket all relevant details.
Please note that an accidental polarization fix is an one time service per account available only if immediately reported.
This document will be updated if new information on this subject arises.