This bug was previously reported on the talk page for the extension here:
http://www.mediawiki.org/wiki/Extension_talk:Semantic_Forms#Delimiters_with_commas_and_spaces
SF appears to have a stricter approach to delimiters for lists of numeric values where the property is one of Has type:Number. While in earlier versions a comma and a space were also accepted as input values, SF now accepts commas only (so the list would look like "1,2,3,4,5" rather than "1, 2, 3, 4, 5", unless a different output is specified using #arraymap). Oddly enough this limitation does not apply to alternative delimiters which may have been chosen in the template (#arraymap...) and in the form (delimiter=..).
This bug - if it may be called one - is reproduced on referata here:
http://scratchpad.referata.com/wiki/Special:FormEdit/Multiplevalues/Multiplevalues
Just click on "Show Preview". The following error message occurs after trying to save the page or get a preview: "There were errors with your form input; see below."
> [field] "must be a valid number".
See also:
http://scratchpad.referata.com/wiki/Main_Page
Version: unspecified
Severity: normal