I don't have the specifics, but some IQ tests test similarities and vocabulary, testing those things outside the same linguistic and cultural population for comparison purposes (which IQ is about) makes no sense.

When tested across a population (Turkish in this case) and the average doesn't come as 100% it's a red flag.

So, I went full detective mode, because there was something I suspected.

https://en.wikipedia.org/wiki/Turkish_Kurdistan

The part where the IQ is "the lowest" corresponds to Kurdistan where:

There has been significant conflict in Turkey over the Kurdish populations' linguistic rights. At various points in its history Turkey has enacted laws prohibiting the use of Kurdish in schools.[19]

In 2014, several Kurdish NGOs and two Kurdish political parties supported a boycott of schools in Northern Kurdistan to promote the right to education in the Kurdish language in all subjects. While Kurdish identity has become more acceptable in Turkish society, the Turkish government has only allowed the Kurdish language to be offered as an elective in schools. The government has refused to honor other demands. In several southeastern cities, Kurds have established private schools to teach classes in Kurdish but the police have been closing down these private schools.[20]

So, that pic is comparing (top right) "Edirne is the capital of the province, notable for serving as the third capital of the Ottoman Empire from 1363 to 1453." to a place where Turkish is possibly a second language (bot right). I wouldn't expect coherent results...