That's interesting. One time-consuming thing you might want to try is to back up your character settings and then reset them to the defaults to see whether the issue still exists. First go to Settings> Application Data> FFXIV then back up every file in there somewhere safe, like a USB drive or PS+. Then, delete the file with the same name as your main character from the PS4's drive. Please be very careful to make sure you backed up successfully before doing this or it will break my heart ;_;

When you log in again all of your filters, HUD adjustments, macros, hotbars and gearsets will be gone and you can quickly set up a new WHM/AST configuration and head into a dungeon to see whether the problem is fixed. If so, that definitely indicates that the problem is somewhere in your character settings/hotbars/macros rather than a weird glitch.

After the experiment you can restore your original settings from the backup file. Or if you haven't made too many customisations and the wipe fixed the problem, you could just keep using the new save file and gradually redo all of your macros. It took me about two hours to remake mine after my data was corrupted at the weekend but if the LB issue is causing frustration it might be worth it.