I had a facet showing the product SKU. The customer can select a product code and then get related items but today I see suddenly all the words of titles grouped. To explain:

This was how it worked:
Product Set:
TEA1235(3)
TEA2345(1)
TEA3456(2)
etc
This means there are three related items TEA1235 forming a set. This is to avoid creating manual 'related to' links.

(PS for those interested in this filter method, the Product set would also show A(364) when there are many codes with "....-A". I tried filtering it away using only the first 7 characters without success).

After updating to Drupal 7.31 Install profile Commerce Kickstart (commerce_kickstart-7.x-2.18) I get suddenly:

Product Sets:
the(70)
with(100)
white(64)
chain(38)
etc
It shows now hundreds of title words that do not exists in the sku field at all.
How can a the SKU product field suddenly show information coming from a title field?? Bit worrying, suppose it would have picked up user info in stead of titles....

In fields: Product » SKU field_product:sku = fulltext 1.0
In Facets: Product » SKU is visible in list
In Blocks : Facet API: Search service: Product display : Product » SKU set to none to stop disable the facet until problem is solved.

The TEA1234-A is properly shown in product listings and full product pages. Also, searching on 'TEA1234' jumps to the right product, the index itself is therefore not altered. The SKU field in facet showing a title details must be picking up details from a wrong field.

Any help would be appreciated.