problem with bevel tool

My guess is you need to apply your scale transforms before using the bevel tool. But if you post a download link to your .blend file I’ll be happy to take a closer look. The best way to do this is by uploading your file to Dropbox, Google Drive, Mega, or equivalent file hosting service then copy + pasting the share link here.

Google changed its defaults; you need to tell it that everybody with the link can ‘see’ the file.

Working now 😉

The main problem is that you are not subtle enough and your bevel is ‘overshooting’.

But first let’s fix the scale:

In Object Mode: CTRL+A > Apply Scale:

Now, in Edit Mode, you can bevel ‘uniformly’. Be very careful:

If you go too far with the width, you get this:

Which looks like your issue…

Couldn’t have said it better myself – @smashhack512 you’re in good hands with @spikeyxxx