I have added **size** filter in Manadev Layered Navigation 
 

    Catalog Input Type for Store  - Multiple Select

Size filter is based on Range i.e  

    1.  0 to 0.5  
    2.  0.5 to 1  
    3.  1 to 1.5  

  
Filter works fine when I update the record in `catalog_product_index_eav,  catalog_product_index_eav_tmp and catalog_product_entity_varchar` table.
But when I come next day , filter value get changed on above table.

Can anyone tell the reason why it is happening?