Export settings after Mac update are now weird!

So, I recently updated my LR Classic. I have some presets set up for when I export different images             (depending on their purpose) and now when I check the box to choose them, I can no longer change the file name to something specific, as well as some other settings. Many options have been greyed out. Should I do a re-install? Or perhaps delete my presets and start again? I am wondering if anyone else has experienced this? There is an addendum by Adobe underneath the export box when I check it, but it doesn't really help solve the problem. Thanks so much!