As Tim said: the dots line up starting at the right edge. So no, there’s no “fix” for making them match on the left (if you use tab leaders). This is how it has always worked and bazillions of books have been set that way.

However, you could probably find other ways to create the dot leaders, such as inserting an anchored frame, or an anchored line.

More info here:
https://indesignsecrets.com/why-cant-i-get-dot-leaders-to-line-up.php

Also, if you’re adventurous, this is interesting news about the recent beta: https://indesign.uservoice.com/forums/601021-adobe-indesign-feature-requests/suggestions/20544646-vertical-lines-between-text-frame-columns

Erica Gamet described a couple ways to achieve that effect in the October issue of InDesign Magazine:
https://indesignsecrets.com/issues/issue-126-charts-and-graphs

Something must be wrong because if you use the Registration color, it always shows up on ALL plates, including process and spot colors. And if you use the crop marks in the PDF export or Print dialog boxes, they always show up on ALL plates.

There are a couple of resources here:

Why You Can’t Trust Acrobat’s Separation Preview

and here:

Acrobat How-To: Previewing Color Separations Onscreen

Excellent point, Ken!

(We are starting to use MasterPlan here at InDesignSecrets, and it’s cool!)