It could be a false positive, have you done a retest with a swab?
It also can be that both men already cured it themselves, with or antibiotics (for something else) or by their immuunsystem. From what I understood this happens all the time, this is also the reason that from couples who go to STD and if one of the two has chlamydia it's mostly the woman. From this forum and other professionals I understood that this comes because in men the bacteria is in the area where the urine comes and with woman this is not the case! But still also a lot of woman cleares from Chlamydia without antibiotics, but it takes much longer. From a few articles in the older expert forum here Dr HHH mentioned that pre antibiotics time the clearing in men is usually within 5 to 6 month and in woman it can take up to 1,5 year. (and in rare cases up to 4 year) But still it would be better for woman to have it tested quickly before you could get any PID etc.