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First thing you need to check: Are you using a widget progressbar from the UMG? Then you percent value need to be in format 0 to 1. Other thing is, if you want to show the percentage in numbers using a text, then you can use 0 to 100. But for the progress bar, be sure you use 0 to 1.
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Are you using a custom pprogressbar in the Hud blueprint? ( not widget) then you can update the value of percent directly and be sure you paint the progressbar in the “event receive draw HUD” or create a custom event to update it
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If you use a widget progressbar, you can access directly to the percent value instead of using the binding function, so you can directly push the value to your widget.
In the school where i give classes of unreal, i saw a lot of times the same problem in my students exercices, and the problen is always the same, they use 0 to 100 to feed the progressbar.