Interaction with elements is bugged.
This happened to me a couple of times where the interaction with elements is bugged (UI)
Affected UI elements and interactions:
1- dismantle
2- upgrade
3- change loadout
I'm not sure how to duplicate this but I believe I loaded into a strike with a 99% resonant element and got to 100% after 1 kill, I tried to change loadout after that but I was locked
I tried exiting the activity but it was locked still.
I tried changing the character but didn't work, I had to restart my game.
A video of the bug is attached.
99% sure this is connection related. When I have experienced this it has nearly always been followed shortly after by being kicked to orbit. Best advice is to restart game or even PC/console.