The letter 'R' seems to be showing slower than actual speed

[HrushikeshDharmadhikari]

I have been practising on Keybr.com from around a few months (with large gaps in between) but now started doing it consistently. Then I saw a small issue:

Whenever a new letter is unlocked, or just about any time, the speed of the letter 'R' is significantly less than I expect. For example, I recently unlocked 'S', and its average speed was 35-36 wpm. But, the letter 'R' was at 27 wpm, even though I am very familiar with it. I tried turning on the 'Unlock a next key only when the previous keys are also above the target speed' option, but it only took 'R' to about 35 wpm, after which it dropped to 25-27 again. I tried to deliberately be slow typing the letter 'O', and it registered 'O' as being slow, but not as quite as 'R'. Any Idea on how to fix this?

My 'R' timeline:

Maybe this is normal?

[HrushikeshDharmadhikari]

The letter 'A' for example

[niloofar-torab]

For me it's letter C. All letters go up to 60 wpm but C is stuck around 27-28 just like your case.