From my understanding of the issue, once you translate the attribute "Kumaş Türü" to English, the Turkish value is overwritten with the English version.
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Timezone: America/Sao_Paulo (GMT-03:00)
Hi Ahmet,
As we discussed on the chat, let's continue debugging the issue here.
Please make sure to have a website backup and if possible, do the updates available here: hidden link - mainly for WC, since its outdated version might be affecting on this behavior.
Then just let us know if it helps or if you still need assistance.