Some parts of HGAW Gundam Airmaster are molded bad?

failure For molded parts:

defect suspected in “E-5” parts.

blog-tagimi.net has found this wrong part on some gunpla, it seems are only few models.

I report here below the official Bandai support (only in japanese)
http://www.bandai.co.jp/support/caution.html

（株）バンダイ静岡相談センター
〒420-8681　静岡県静岡市葵区長沼500-12
TEL：０５４－２０８－７５２０
受付時間　平日　１０時～１６時（土・日・祝日、夏季・冬季休業日を除く）