Will my friend face issues crossing the border due to a previous overstay in Thailand without an overstay stamp?

I think we took this as far as we can go 🙂

CHECK YOUR STAMP before you walk away from passport control

Okay, Ellie brought up a good point in the mod chat,

If they just gave him a 30 day extension for 1900baht after he paid the "overstay" and didn't correct the stamp then his entry stamp should be a ผ.30 type AND that means that his eVisa tourist visa is still valid so when this current stamp is running out he can go to the border stamp out and then present the eVisa when he comes back in and get 60 days

Good thinking, might have a still valid tourist visa he can use to get back in and get his 60 days IF he is going to stay longer.

As a rule IF you fly in you can go to any immigration office and get a bad stamp corrected for free.

AND

Unfortunately as a rule, if you stamp in with a bad stamp from a land border, you mostly have to go back there to correct it <- another good reason to check your stamp while you're standing in FRONT of passport control as soon as they give your passport back.

Also I am of the opinion that noticing the stamp was wrong AT the immigration office when he went to get the extension that he'd got 30 days when should have gotten 60 would NOT accrue a fine.

It is a bad stamp NOT an overstay.

Even though the person could be faulted for not checking their stamp sooner 😕, they shouldn't have had to pay anything to get the stamp corrected to the 60 days and then get the extension for 1900baht.

I had the same problem and the officer in Chiang Rai called office in Bkk and fixed it for me free….

did he get a receipt for the 15K baht "overstay" (bad stamp) fine?

He wouldn't get an overstay stamp because he wasn't overstaying, all he should have done was print out his eVisa and went to any immigration office and they'd have fixed the stamp and let him get a 30 day extension