Can no longer move apps to ST card

[AC Question]

Hi

I just downloaded an android update, for which I had to move several apps to my ST card to make room for. This I was able to do without any problem. However after the software update I am no longer able to move any apps. I get an error message saying there is not enough room, despite having used just over 9Gb of the card. I think it's 14Gb in total.

Any help would be appreciated.