When in your arsenal, if you have a weapon or frame with more than one configuration, there is a (new) strange bug happening:
If you modify your mods on config A and config B (rearranging their order), then apply a forma while viewing config B, config B will have behaved as expected, however the mods on config A will have gone back to whatever order they were in before rearranging them.
If the rearranging was done to pre-associate the polarities, it's possible a mod will be removed from your config due to lack of capacity (as expected).
The expected behavior is that applying a forma doesn't cause your other configs to travel back in time.
I have forma'ed several weapons since Duviri came out and this has been happening every single time so I believe the bug to be easy to replicate. If you need footage or more details, I can save&upload a video once I experience the bug again.