I had something similar happened when I removed the bracelet from my watch and put it back on. It was nice and tight before and then afterwards it was loose like that. Turns out even though the spring bar was in the hole, it wasn't perfectly inside the hole. I had to remove it and put it back on a few times before it was back on nice and tight like before. Not sure if this is your issue but I'm just sharing my expereince.
Removed it a couple times and got it back on, unf that didn’t help. As far as I can see the springbars Sit quite good in there.
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