photo update date and photo caption change date [closed]

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url - http://ranwmls.rets.paragonrels.com/r... username - DataBase

It doesn't look like "L_Last_Photo_updt" is updated when photo caption is changed - "MED_update_dt". MLS#50185180 has "L_Last_Photo_updt" as "2018-06-11T19:05:00". From the media resource, the first photo "MED_update_dt" is "2018-06-11T21:53:09" and the last photo "MED_update_dt" is "2018-06-11T22:26:42". Shouldn't "L_Last_Photo_updt" be updated when photo caption changed according to the latest "MED_update_dt"?