queries on searchengine returns 404

[Michaelgs]

Store ID: 38485
Website URL: http://partythemesforbirthday.com
URL to page in question: all

before I started to use datafeedr I was getting 100 plus unique visitors per day.now I get maybe 5-10 per day

checking out Webmaster tools I found that the search queries invariably return a 404 page
example
query: /2nd-birthday-party-themes
result: http://partythemesforbirthday.com/2n...y-party-themes
should be: http://partythemesforbirthday.com/st...-party-themes/

Query details: elegant prince damask
result :/store/thumbnail/62700002597110/elegant-prince-damask-essential-party-pack-for-8/
should be: http://partythemesforbirthday.com/st...2700002571047/

what do I need to do to fix this?