SOLR sort on dynamicField with type string

Question

I got problem with sort in solr on dynamicField which type is string;

<dynamicField name="*_SEARCH"  type="string"  indexed="true"  stored="true" multiValued="false"/>
<fieldType name="string" class="solr.StrField" sortMissingLast="false" />

result are paging(I got 100 documents; 20 for page), and he sort only first page

for example I get 20 documents with sort by this field with value:

1. 9999.0
2. 9999.0
3. 22222.0
4. 22.2

5. 22.2

   . . .

6. 10.0
7. 0.0 8.

as can You see problem is with the order

sort parameter: (dynamic content)_SEARCH desc