SCWMLS querying by l_last_photo_updt not returning all results

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Hi, I'm new to SCWMLS but not to RETS. I've noticed there are some gaps in our image download and I'm not sure what I'm doing wrong. We want to incrementally download photo updates so we've been using l_last_photo_updt to figure out which listings have been updated recently, then take those listingIDs and look up their photo URLs with GetObject. GetObject works fine, but our query to determine which listings are affected isn't working too well.

Example query: (L_Last_Photo_updt=2018-06-08T19:22:24-2018-06-08T20:08:29)

Example listing: 1832946

This listing's l_last_photo_updt is 2018-06-08T19:31:00 so I would expect it to be returned with the above query. I do get 15 listings back, but this isn't one of them. Any idea why that might be?

RETS version: 1.7.2

URL: http://scwmls.rets.fnismls.com/rets/f...

Account name: Blossor

Thanks!!