Is a corrected OA visa stamp sufficient and what should I do about the missing arrivals card?

The user arrived in Bangkok with an OA visa but encountered an issue where the immigration officer initially stamped a three-month stay before correcting it. They are concerned whether the correction will cause problems when applying for a multiple re-entry permit. Additionally, the arrivals card was not retained by the officer, raising concerns about potential issues. Community responses suggest that the correction of the stamp is acceptable and that the absence of the arrivals card is likely not an issue.