Sometimes, the colour picker will incorrectly label the V value of a colour. Here's an example:
1. If you choose an HSV of 0/0/50 (medium grey), you will end up with an RGB of 127/127/127. 255/127=49.8%. Correct.
2. If you choose an HSV of 0/0/49 (marginally darker medium grey), you will end up with an RGB of 124/124/124. 255/124=48.63%. Correct.
3. If you choose an RGB of 127/127/127, you will end up with an HSV of 0/0/49. This also occurs if you start as in example 1. and switch between your 2 colours. My guess is that this is due to a rounding error, because, as I mentioned, 255/127=49.8%, so it rounds downwards.
This bug isn't a huge issue because the RGB value doesnt change, but it can be confusing and annoying. An easy solution would be to change HSV to be from 0-255 instead of 0-100, or an option to view it as such.