it is correctly stamped with ผ.60–ม.17 , but as per the Orders of the Burapha Command of the Royal Thai Army, Thai Immigration is instructed to give a reduction of only 7 Days Stay to Cambodian Passports entering via land borders with Cambodia (this area [Border Checkpoint] of the land border is under Burapha Command)
However, if Cambodian Passports enter via air, or even other land borders (with other countries), then they get the normal (full) 60 Days
กกล. บูรพา or กองกำลัง บูรพา (กองทัพภาคที่ 1) = Burapha Command (1st Army Area)
When you entered Thailand after the DTV rejection, was this an actual Thai Tourist Visa TR60 that you applied and paid for at a Thai Embassy/Consulate??
or, was it actually only a Visa Exempt Entry Stamp made by a Thai Immigration Officer at arrival??
After the e-Visa application has been approved, a confirmation email will be sent to the applicant's registered email. The applicant is kindly requested to print a copy of the confirmation email to present to the airline at the port of departure and to Thai immigration officials in Thailand.