After playing around with X, Y and R keys I can show that there isan issue with a repeated cycle of R followed by Y keystrokes when the text is vertical causing the netlabel **text** to wander away from the netlabel **anchor point**.
Initial placement:

After an X keystroke:

Another X keystroke:

After a Y keystroke:

After an X Keystroke:

Another an X and then a Y keystroke:

These positions persist after any number of X and Y keystrokes in any order:

After several more X and Y key strokes in no particular order, back where we started:

However do a single R (rotate) keystroke:

and then follow it with an X keystroke:

then R:

R followed by Y:

After some more R and then, with the text vertical doing Y:

And then some more X, Y and R:

and:

and:

and after lots of R and then Y with vertical text you can get to:

Chrome
76.0.3809.132
Windows
10
EasyEDA
6.2.43