wrong data in feed

Hi there,
i got issues with some newly added products they don’t show the right data in the feed so i get some error messages for this new products back from the google merchant center please help and give me some advice how this can happened.
some how the feed does not pull the right data:
the feed shows like this:
<item>
<g:id>sk-tru-inde-144-vin-ro</g:id>
<title>
<![CDATA[ FCS M7 Honey Blau All ]]>
</title>
<g:google_product_category>
<![CDATA[
Sporting Goods > Outdoor Recreation > Skateboarding > Skateboard Parts > Skateboard Trucks
]]>
</g:google_product_category>
<g:price>42.99</g:price>
<g:condition>new</g:condition>
<g:availability>in stock</g:availability>
<g:adult>no</g:adult>
<g:identifier_exists>yes</g:identifier_exists>
</item>
<item>
<g:id>sk-tru-inde-144-vin-ro-x</g:id>
<title>
<![CDATA[ Rechnung 1232 ]]>
</title>
<g:google_product_category>
<![CDATA[
Sporting Goods > Outdoor Recreation > Skateboarding > Skateboard Parts > Skateboard Trucks
]]>
</g:google_product_category>
<g:price>42.99</g:price>
<g:condition>new</g:condition>
<g:availability>in stock</g:availability>
<g:adult>no</g:adult>
<g:identifier_exists>yes</g:identifier_exists>
</item>
</channel>
</rss>

so it mixes up some invoices as product title or it even shows the product title of a different product.
The rest of the product sow just fine.

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