"Enter a range between 6 and 28 weeks" confusing

Just some minor site feedback: 

Trying to create a gold custom plan and when I get to stage 5 I get the message "Enter a range between 6 and 28 weeks" and it takes me back to stage 1.  There's no field where I can enter a number like this and no fields are highlighted to explain what I'm doing wrong.

I've worked out that the date of the event must be between 6 and 28 weeks from the start of the plan, but the error message is misleading.  I'm sure it makes sense to the creator of the website, but it took me a few goes to work it out. 

Also, when it creates the custom plan, the weekly totals don't add up.  I use metric, not imperial, so perhaps there's a conversion problem.  (It's also worth noting that I can only enter imperial distance units at the first stage of creating a plan for swim, run, bike. Sorry, but the USA is about the only country left in the world that uses this old system!)  The swim distance weekly summary appears correct but the bike and run summaries are "miles" off (so to speak).  See attached file. 

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