weird value for weight [επιλυμένο]

I wonder where did this come from?
the medal is 156.6 grams only. (I've added it)
where did the .600001 come from?
https://en.numista.com/catalogue/pieces167528.html

Someone must have done it since, as the page looks alright now.
Does the Records page now also look alright?

No the record page is still wrong hence my confusion, as the coin page has always been correct

Yes, agreed, just answered my own question.

As I temporarily removed my largest and pretended that I had yours, then
refreshed the page and results shown above. Then I went into the page
and removed the weight and re-typed it, but the result was still the same.
Strange.

A bug. Don't know why but if you try to type "156.6000000000000" and submit the modification, it will automatically transform it into 156.0000999975.

Fixed :)

Yes. Thanks