Stuck In Quaternion Rotation

So, I have no idea how I’ve managed it but some how the object that I’m working on seems to be stuck using quaternion rotation. The scale and dimensions sliders have turned purple in the properties panel, as has the rotation drop down. Clicking this list the usual Euler rotations but clicking on them doesn’t actually change anything. This seems to be object specific, but I can’t for the life of me figure out what option I have turned on or activated so can’t turn it off.

Any help would be appreciated!

Right-click on these “purple” properties and select “Delete Drivers”.

That’s great! Thanks for the help. Not entirely sure how I managed to turn that on though, as I right clicked on those while modelling.