As an afterthought you MUST obtain a re-entry permit (single or multiple) if you want to travel out of the country when on a valid Retirement Visa/Extension. Without the re-entry you will go back to square one when coming back to Thailand (ie: your Retirement Visa/extension will be voided.)
Actually looking at your OP post more clearly, you must have had a re-entry on the 25th, so my above advice is probably not required but I'll leave it anyway, as it maybe useful to others.