[bug?] Time Ruler Problem

See attached JPGs…

I am using “set timecode at cursor” to set the time code to 0:01:00:00, at bar 53 in the song
Snap is on, the cursor was aligned perfectly on bar 53.

As you can see, in C6 the “seconds” shown on the ruler track, now has three decimal places !

If I zoom in on bar 53, I see that there is no exactly “1:00” beneath it, as I would expect… instead, it is offset slightly, with three decimal places.

This displays fine in C5 … and makes it hard to read in C6.
C602 - Time Ruler Problem.JPG
C602 - Time Ruler Problem - Zoomed.JPG
C553 - Time Ruler Looks OK.JPG