highfive

I've had it happen to me twice, both at Ban Laem and at Ban Pakkard. Both times it was because the IO failed to notice that I have a MULTIPLE entry visa. Each time, after they finally realized it, they let me through. The Cambodian side also needed a lot of pointing out that I still have a valid multiple entry visa.

cool story bro

Go to Ban Pakkad instead, it's ~100km from Poi Pet and you can do an in-and-out if you have a multiple entry visa. I did it last month. They might ask for an extra payment on the Cambodian side for getting stamped out immediately. Just make it clear that you already have a visa for Thailand.