Why won't one of many images save at the same size?

i'm experienced ps user/commercial photographer, doing work without big issues. i've experienced weird anomaly in prepping images website and wonder if can figure out must overlooking?  after making color/tone/compositing edits on each image, run them through series of droplets, variously flatten, sharpen, size, change color profiles , on. these self-made droplets save me lots of time , effort, , have worked years. end result each image should srgb jpeg fits page dimensions of site, @ size optimized minimal degradation , quick loading. these images should weigh in anywhere 250 560 kb, , without exception, have. until now. before go last droplet (which save them jpegs @ quality level) flattened tiffs, same pixel dimensions. final jpegs vary little in size, based on complexity of each image, one, single image winds @ 2.1 mb - more 5 or 6 times size of other images.  i've gone , looked @ image @ each stage of development, , cannot life of me see how differs mates, or why won't save @ 400 kb or so.  there no saved channel in psd, nor else can think of might have missed. ideas?

 

the image loaded onto website now, large though may be.  can see here in new collection of images...

 

cruise 1_5 | todd pearson - professional; photographer

 

thanks,

 

todd pearson

one reason complexity of image  -- difference in neighboring pixels -- affect compressed image size. example, 8x10 scribble produces jpeg ten times size of white page.

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