Deleting a blocked window immovilizes the tokens

[MasterZamna]

Recently I was creating a new Map, using a Win10 system (Spanish version), with the 5e system with the tools using two images I placed in the data folder, bottom a JPG, an ocean layer and a PNG on top, then I made a window LOS element over the top layer, using an open line, checked if it worked properly for opening, closing, and blocking movement, using a Mac client of FGU to simulate an external player, then I tried blocking the window so Players couldn't open it, but the control in the GM side didn'd show in the proper position, although it did in the player's side, so I deleted the element and creates a new window with the rectangle tool, then the control appeared properly, and I could block it successfully.
But then, while detailing, before creating any other LOS element, I deleted all nodes from the window one, but it was still blocked, then I noticed that the color mark stayed in the map, but ctrl+z didn't bring back the nodes, and the tokens could not be moved any more,either by the player or GM side, only when I removed the movement restriction they could be placed freely, but if the restriction is turned on again, the player is able to ask for a movement, but authorizing it by the DM side doesn't change it's position. I tried restarting both clients but the problem persisted even after that.
I know that it's just easy enough deleting that and creating a new one, since I was really starting the build, but I thought that it might be useful to let know the issue in case something can be done, to prevent others this, with more advanced progress.

[LordEntrails]

What date version are you using? What extensions do you have loaded?

Have you tried on a different map or different/new campaign?

Can you post any screen shots to show more clearly what's going on?