Why do girls online often change their profile picture immediately/soon after they are given a compliment about their looks?

Anonymous
NOT ALL!

Okay now that that is out of the way, i was wondering why this seems to be a thing with a lot of girls i may interact with when online. Like, i may be in the mood for paying a girl a compliment, and I'll notice that quite often, they'll immediately or quite soon after change their profile picture. I never really understood why some women do this, because when i get complimented on a profile picture, im more encouraged to leave it up, not change it! i've seen it happen so many times now, i feel like its actually a thing that a lot of girls do. So ladies or guys... enlighten me.
Updates
+1 y
P. S. just to be clear on this, the girls usually change it to another picture of themselves, one that is usually similar to the last one in terms of quality and visibility of themselves within the shot
Why do girls online often change their profile picture immediately/soon after they are given a compliment about their looks?
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