String Breakage Questions

I’ve been testing bass strings to find something that can endure intensive tremolo use and after my most recent ‘D’ string break, I’ve noticed that it is almost always the ‘D’ string that breaks and that it’s always at the same spot on the roller (as seen in the photo – click on it for a close up). Broken String

So I’m asking myself : Why the ‘D’ string? Why always at the same spot?

Any clues or insights would be appreciated!

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