If selecting one edge doesn’t fix your problem, check your object’s scale. If it’s not 1:1:1, trying applying scale to your model in object mode, then beveling again.
Same cube, same bevel. The green cube hasn’t had scale applied, the blue one has.
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tried that, didn’t work
i did that tho, the image is the aftermath
Duplicated edge there, use merge by distance…
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it’s the aftermath of the bevel
There must be something wrong with the geo for bevel to behave that way.
Try G_De’s and MichaelBenDavid’s suggestions (apply scale of the object in object mode and “select all - m - merge by distance” in edit mode), before you do the bevel.
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