The following shows a simple rounding error
When a user has read 1 million posts, discouse displays, “1.0 M posts read”
But when 999,500 - 999,999 posts have been read, discourse rounds up and displays 1,000K instead of 1.0M
I must’ve been insanely lucky to observe this since it’s in a range of 500 posts:
(5th row, 6th collumn)