Not a surprise...as we have been warning on this forum... AVOID POIPET BORDER CROSSING. It's a BIG problem for foreigners entering Thailand from Cambodia... especially if you are trying to do it yourself.
This was POSTED in October 2022 by Tod Daniels...
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"Cambodia;
The info we have on the border crossings with Cambodia are AVOID <-(read that as DO NOT GO) to the Aranyaprathet / Poipet border. It is problematic. Ban Laem / Duang and Ban Phak Kad / Phsar Prum are workable borders but bouncing on your own you will be asked for "fees" to get back in. Ban Hat Lek / Cham Yeam in Trat can be finicky, Chong Chom / O Smach in Surin isn't too bad.
They CAN hard line you and say you have to spend a night in cambodia if they want to at ANY of the border crossings before you can stamp back in to thailand. "