You need to depress the delta/triangle buttons in the Coordinate bar so that the values for x, y, r and a are reported as values relative to the start point, rather than the origin of the layout, just like in model view.
(I scratched my head at first since I rarely use the coordinate palette now. From my last use, I had left my x/y delta depressed, and read tracker-matching values there - but the delta for r/a was up, and like you, I was seeing not only strange values in r, but also the angle "a" was not only not zero, but it kept changing as I was shift-dragging horizontally. Made me realize what the issue was.)
Cheers,
Karl
AC 28 USA and earlier • macOS Sequoia 15.3.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB